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Pacinian corpuscle

n. A sensory nerve ending surrounded by several layers of connective tissue about the size and sh...

pain

n. An aversive experience usually associated with stimulation of free sensory nerve endings, nerv...

pain, acute

n. An aversive sensory experience which occurs rapidly or lasts only a short time, usually associ...

pain, chronic

n. An aversive sensory experience which lasts a long period of time, usually associated with stim...

pain coping strategy

n. A plan for an action, series of actions, or thought processes used in an attempt to deal with ...

pain pathway

n. Any of numerous nerve paths that carry the sensations of pain from nerve endings toward the ce...

pain receptor

n. Any of the free nerve endings throughout the body that respond to mechanical deformation, heat...

pain threshold

n. The minimal level of a particular stimulus required for the experience of pain.

pain tolerance

n. 1. The ability to continue normal functioning despite experiencing pain. 2. In physiology expe...

paired-associate learning

n. An experimental procedure in which subjects are required to learn pairs of items usually so th...

paired comparison

n. 1. In sensation research, a method of measuring some aspect of sensation in which pairs of sti...

paired samples t test

n. A comparison of the mean of the differences in a set of number pairs divided by a measure of t...

panel study

n. A research design in which a group of subjects is measured repeatedly over time in order to de...

panel survey

n. A research design for measuring attitudes, opinions, judgments, or other variables of interest...

panic attack

n. A brief, discrete period in which a person experiences intense fear or discomfort in the absen...

panic disorder

n. A mental disorder characterized by repeated discrete periods in which the individual suffers a...

paper-and-pencil tests

n. Paper-and-pencil tests in psychology are sometimes referred to as questionnaires, inventories,...

Papez circuit

n. One of the major pathways of the limbic system, which is chiefly involved in the cortical cont...

Papez's theory of emotion

n. Papez (1937) enhanced the Cannon theory by refining the neuroanatomical structures involved an...

papilla

n. Any small biological projection, such as those on the tongue, including the vallate papillae, ...

paradigm

n. 1. A prototype, model, pattern, or general conceptual framework within which an approach to re...

paradigm shift

n. A rapid and large shift in the general point of view within a science or an area of science su...

paradox

n. 1. A logically valid argument based on accepted premises which yields a conclusion which contr...

paradoxical intention

n. A psychotherapeutic technique in which the client is encouraged to engage intentionally in a n...

paradoxical intervention

n. An action taken by a therapist in which the client is encouraged to engage intentionally in a ...

paradoxical sleep

n. A sleep stage during which rapid eye movements occur and dreams are frequent. Also called REM ...

paralanguage

n. The nonverbal aspects of oral communication including tone, voice quality, timing, loudness, i...

paralinguistics

n. The study of the nonverbal portion of spoken language including tone, voice quality, timing, l...

parallax

n. The differences in the apparent motion of objects when the observer moves so that the apparent...

parallel distributed processing

n. (PDP) In cognitive psychology, any of several approaches to learning and memory in which knowl...

parallel forms

n. In testing, two equivalent forms of the same test. Also called alternate forms.

parallel forms reliability

n. The level of a test's measurement error determined by examining the consistency of the scores ...

parallel play

n. A form of children's play in which they play beside each other but do not coordinate their pla...

parallel processing

n. 1. Any computer setup in which there are two or more processors which work independently and s...

parameter

n. A numerical characteristic of a population such as the mean or standard deviation, which may b...

parametric statistic

n. Any form of sampling or mathematical inference from a population whose parameters are known, a...

paranoia

n. A general term for any form of illness characterized by delusions of persecution. This can inc...

paranoid delusion

n. Any well-developed set of beliefs in which a person reasons logically from obviously false pre...

paranoid disorder

n. Any illness characterized by delusions of persecution. This can include delusional disorder, p...

paranoid personality disorder

n. An enduring pattern of adjustment in which the individual is pervasively distrustful and suspi...

paranoid schizophrenia

n. A pervasive mental illness characterized by persecutory and/or grandiose delusions and auditor...

paranormal

adj. 1. Of or relating to any phenomena inexplicable by scientific principles. 2. Referring to th...

paraphilia

n. Any form of recurring, intense sexual arousal, urges, or actions inconsistent with cultural no...

paraplegia

n. Paralysis of the legs and usually the lower part of the abdomen often due to injury to the low...

parapsychology

n. The field of study like psychology that deals with communication that does not follow the laws...

parasuicide

n. The infliction of self-injury that falls short of death and may or may not have death as a cle...

parasympathetic nervous system

n. The portion of the autonomic nervous system that stimulates the smooth muscle systems in the b...

parathyroid gland

n. Any of four small endocrine glands attached to the thyroid gland at the base of the neck which...

parental ethnotheories

n. Parental cultural belief systems.

parental investment theory

n. Parental investment theory is an important middle-level theory in evolutionary psychology that...

parent-child interaction

n. 1. An instance of a reciprocal stimulation of a parent and their child resulting in mutual inf...

parenting

n. All aspects of behavior by adults with children intended to protect, nurture, teach, disciplin...

parietal lobe

n. The portion of the brain in the middle of the side of the cerebral cortex separated from the f...

Parkinson's disease

n. Parkinson's disease is a disease of the nervous system characterized by trembling arms and leg...

paroxetine

n. An anxiolytic and antidepressant medication commonly prescribed for depression, which works by...

parsimony principle

n. The basic scientific principle that the simplest explanation is the best one. Simplicity is de...

part correlation

n. The correlation between two variables with the variance of a third variable removed from one b...

partial correlation

n. The correlation of two variables with the variance of one or more other variables mathematical...

partial reinforcement

n. An instrumental conditioning technique in which only some appropriate responses are rewarded, ...

partial-report technique

n. A procedure in memory studies in which only part of the learned information is tested. This ha...

participant

n. Any subject in any psychological study, including both experimental and control subjects.

participant observation

n. A research methodology that involves direct participation of the researcher within the context...

participant observer

n. A researcher conducting participant observation research methodology. Being a participant obse...

passionate love

n. 1. A powerfully erotic attraction or attachment. 2. A form of love involving passion and commi...

passive-aggressive

adj. A characteristic of behavior that hostilely obstructs progress toward a goal while seeming t...

passive-aggressive personality disorder

n. An archaic category of personality dysfunction included in the appendix of the DSM-IV-TR chara...

passive avoidance

n. Learning to refrain from emitting a particular response in order to avoid punishment in operan...

passive avoidance conditioning

n. The process of learning to refrain from emitting a particular response in order to avoid punis...

pastoral counseling

n. Psychotherapy or advice on adjustment to personal problems delivered by religious personnel to...

path analysis

n. Path analysis is a multilevel strategy for analysis of complex interrelationships among variab...

pathogenesis

n. The origin and process of development of a disease or disorder. Also called nosogenesis and pa...

pathognomic

adj. Of or relating to the signs or symptoms indicative of particular disorders that distinguish ...

pathological gambling

n. The inability to resist impulses to wager or bet in a pattern that causes significant discomfo...

pathological liar

n. A person who persistently and compulsively says things they know to be untrue whether or not t...

pathological stealing

n. An inability to resist impulses to steal or shoplift despite absence of need for the stolen ob...

pattern discrimination

n. The capacity of organisms to respond differently to varying patterns of sensory stimuli in all...

pattern recognition

n. 1. The ability of organisms to recognize patterns of stimuli and respond differently to them t...

Pavlovian

adj. Of or relating to the person or ideas of Ivan Pavlov, a 19th-century physiologist who won a ...

Pavlovian conditioning

n. A type of learning in which a stimulus to which an organism does not initially respond (the co...

Peabody Picture Vocabulary Test

n. A measure of verbal ability for all persons over the age of 2½ in which sets of four blackand-...

peace psychology

n. A branch of psychology that focuses on ending and preventing wars through nonviolent conflict ...

peak experience

n. A short period in which one experiences an intense sense of unity, clarity, insight, sometimes...

Pearson chi-square test

n. A set of tests used with categorical data in which the degree to which a data set fits a theor...

Pearson product-moment correlation

n. A numerical index of shared, linear relationship between two variables. The Pearson product-mo...

Pearson's correlation coefficient

▶ See PEARSON PRODUCT-MOMENT CORRELATION

pedophilia

n. Preferential sexual desire for, arousal by, and sexual interaction with prepubescent children....

peduncle

n. Any star-shaped biological structure, such as the cerebral and cerebellar peduncles, which are...

peer group

n. 1. Any group whose members have approximately equal status within some social context, which i...

peer rating

n. A numerical evaluation of an individual by other members of an identifiable group to which the...

peer relationship

n. Any relationship between individuals who regard themselves as equals or who are identifiable a...

peer review

n. The process of scientific review in which researchers read and critique each other's work, usu...

penetrance

n. In genetics, the degree to which the characteristic(s) associated with a particular form of a ...

penis envy

n. In psychoanalysis, a girl's envy of the perceived power of a man's penis to make the mother lo...

perceived self

n. The total of an individual's conceptualizations about herself or himself which affect interpre...

percentile score

n. More commonly called a percentile rank, a percentile score designates the percentage of scores...

percept

n. The mental representation of a sensory object experienced or used by an organism, as distingui...

perception

n. The process, product, or act of creating coherence from the patterns of energy impinging on se...

perception, binocular

n. The process, product, or act of combining information from two eyes to form a visual image or ...

perception, subliminal

n. The process, product, or act of creating coherence from the patterns of energy impinging on se...

perceptual constancy

n. The maintenance of a continuous perception of the characteristics of an object despite variati...

perceptual field

n. 1. In Gestalt psychology, the whole of the environment that an organism perceives at one momen...

perceptual illusion

n. Any misperception of the external world brought about by the interaction of the particular str...

perceptual memory

n. The long-term store of sensory information about particular objects such as people's faces or ...

perceptual-motor skill

n. Any particular ability to perform a task which involves the integration of sensory information...

perceptual organization

n. The process or product of creating coherence in sensory information. Gestalt psychology create...

perceptual schema

n. Internal representation of the structure of sensory objects to which sensory data is compared ...

perceptual set

n. 1. A frame of reference or set of schemas that guide the interpretation of sensory information...

perfectionism

n. Perfectionism refers to a trait-based tendency to hold extremely high expectations of the self...

performance anxiety

n. 1. A generalized fear which occurs before one is required to perform a public act, which usual...

performance appraisal

n. A formal evaluation of an employee's job performance usually done by the employee's immediate ...

performance test

n. A test of ability requiring manipulation of objects rather than simply verbal or written respo...

peripheral cue

n. Environmental information which is used to select which of alternative interpretations of sens...

peripheral nerve

n. Any nerve cell or fiber outside the brain and spinal cord.

peripheral nervous system

n. The system of nerves which collect information from and control the functioning of the body an...

peripheral vision

n. The perception of visual information outside the central focus of the eyes around the edges of...

perlocutionary act

n. The act performed of causing an effect on others (such as alerting, persuading, or amusing), a...

permissive parent

n. A father or mother who makes few demands on children and tends to avoid exercising control ove...

persecution, delusion of

n. Any well-developed set of beliefs in which a person reasons logically from obviously false pre...

persecutory delusion

n. Any well-developed set of beliefs in which a person reasons logically from obviously false pre...

perseveration

n. 1. In general, the repetition of an act after it has become inappropriate. 2. Inappropriate re...

persistent vegetative state

n. A prolonged state in which there is minimal brain function, which usually includes maintenance...

persona

n. 1. In Jungian psychology, a basic structure of mind which leads people to construct a social m...

personal construct theory

n. The theory of George A. Kelly in which the individual is presented as an intuitive scientist w...

personality

n. The dynamic organization within the individual of common traits, behavior patterns, values, in...

personality assessment

n. Some psychologists believe that human behaviors represent manifestations of underlying psychol...

Personality traits.

Personality traits are hypothetical constructs. As such, they cannot be measured directly with el...

Personality questionnaire.

One way in which to assess degree of extroversion in a person might be to observe how talkative a...

Problem of misrepresentation.

One problem with using behavior statements in personality questionnaires is that there is no inhe...

Other forms of personality assessment.

Other paper-and-pencil methods of measuring personality are available that do not use behavior de...

personality disorders

n. A pervasive and enduring pattern of dynamic psychophysical processes, subjective experience, p...

personality inventory

n. A questionnaire type of personality test that includes several scales to survey a particular d...

personality, multiple

n. The presence of two or more distinct personalities or identities in the same person, who recur...

personality organization

n. The coordination, integration, and unification of the different, values, traits, behavior patt...

personality, split

n. The presence of two or more distinct personalities or identities in the same person, who recur...

personality test

n. A group of procedures designed to quantify or classify some aspect of personality in an indivi...

personality theory

n. Any integrated set of constructs which attempts to understand the individual as a unit, includ...

personality trait

n. An enduring neuro-psychic structure that guides perception and reaction so that the individual...

personality type

n. A category of human functioning into which humans can be sorted according to any of a number o...

personal project

n. An extended set of actions related to an individually selected goal which is derived from the ...

personal striving

n. A system of personal goals which involve a complex set of interrelated values and aims derived...

personal unconscious

n. In Jungian theory, the relatively small portion of the unconscious which is unique to the indi...

person-centered therapy

n. The therapy developed by Carl Rogers which assumes that each person lives in a reality of his ...

personnel evaluation

n. The processes of rating the performance and worth to the organization of individuals employed ...

personnel psychology

n. The branch of psychology that deals with the selection, placement, training, supervision, mora...

personnel selection

n. The process of identifying and selecting candidates for particular jobs based on their suitabi...

personology

n. The holistic study of individual human beings with a focus on their individual uniqueness and ...

person-situation debate

Definition. n. The person-situation debate was a controversial discussion that lasted two decades...

person-situation interaction

n. Person-situation (P × S) interaction refers to the process whereby enduring personal qualities...

perspective taking

n. The mental capacity to imagine a point of view different from one's own, usually either anothe...

perspectivism

n. Developed by William J. McGuire, perspectivism is an epistemological stance that combines prag...

persuasion

n. The act or process of inducing another person or persons to change their ideas, beliefs, attit...

persuasive communication

n. Information conveyed with the intention of shaping another's point of view on a particular topic.

pervasive developmental disorders

n. A family of childhood disorders characterized by severe and encompassing impairment in multipl...

pessimism

n. Pessimism has been described as generalized negative outcome expectancies as well as a negativ...

petit mal

n. A form of epilepsy in which the individual's seizures do not involve gross muscle movements.

PET scan

n. Positron emission tomography. A method of creating images of the insides of bodies including t...

phallic

adj. Of or relating to the penis; often used in psychoanalysis to refer to anything resembling a ...

phallic phase

n. In psychoanalysis, the phase of development, beginning about age 3, in which children begin to...

phallic stage

n. In psychoanalysis, the phase of development, beginning about age 3, in which children begin to...

phallic symbol

n. Any object which bears some resemblance, either physical or nonphysical, to a penis, which is ...

phallus

n. A penis or a symbolic representation of a penis.

phantom limb

n. The sensation that a missing arm or leg is still present, which is often experienced as pain o...

pharmacology

n. The study of the effects of chemicals on the body and research into the best uses of chemicals...

phenobarbital

n. C12H12N2O3. A long-acting barbiturate which acts as a central nervous system depressant, which...

phenomenal self

n. The active perception of a person by himself/herself. The self as perceived is very changeable...

phenomenological method

n. A research method in which data consists of an individual's record or description of his or he...

phenomenology

n. The study of experience in its own terms without reference to any thing or theory which is not...

phenomenon

n. 1. Any single experience or observed event. 2. An odd or unusual event or individual. 3. Any o...

phenothiazine

n. A family of older, antipsychotic drugs often referred to as typical antipsychotics, including ...

phenotype

n. In genetics, the actual characteristics of an individual, which may differ from those of anoth...

phenylketonuria

n. (PKU) The presence of high levels of phenylketones (phenylpyruvic acid) in the urine due to an...

phi coefficient

n. A linear measurement of the degree of relationship between two dichotomous and randomly distri...

philosophy of science

n. The branch of philosophy which examines science, the methods of science, scientific explanatio...

phi phenomenon

n. An apparent movement from one location to the other, which is perceived when two lights quickl...

phobia

n. An irrational and persistent fear of a particular thing, event, or situation which is extreme ...

phobia, simple

n. An irrational and persistent fear of a particular thing, event, or situation which is extreme ...

phobia, social

n. An irrational and persistent fear of interaction with other people which is extreme enough to ...

phobic anxiety

n. The irrational fear experienced by a person with a phobia or irrational fear when exposed to a...

phobic disorder

n. Any mental illness that involves an irrational and persistent fear of a particular thing, even...

phoneme

n. A phoneme is an abstract mental representation of a sound or family of sounds. The collection ...

phonemic restoration

n. The phonemic restoration effect is a phonological illusion informative about the processes inv...

phonemics

n. Phonemics is a term used to describe the study of phonemes and phoneme systems, a use of the t...

phonetic alphabet

n. A phonetic alphabet is a set of symbols used to transcribe the sounds of natural languages. On...

phonetics

n. Phonetics is a field of inquiry concerned with the study of speech sounds by examining the art...

phonology

n. Phonology is the component of a language's grammar which licenses the sound structure for sent...

photopigment

n. A chemical in the rod or cone of the eye which undergoes a change in state when struck by a ph...

photoreceptor

n. A cell or mechanism which responds to the impingement of light in an organized way, such as th...

photosensitive epilepsy

n. A seizure disorder in which seizures are triggered by light, usually bright light or light wit...

phototaxis

n. Movement toward or away from light such as that of many plants which move toward sunlight. It ...

phototherapy

n. A treatment involving exposure to particular wavelengths of light. Many skin conditions are tr...

phototropism

n. A movement toward or away from light such as that of many plants which move toward sunlight. I...

phrenology

n. An archaic theory in which the shape of the skull was associated with personality and various ...

phylogenesis

n. 1. The evolutionary development of any group of organisms. 2. A diagrammatic representation of...

phylogenetic

adj. Of or relating to the evolutionary development of any group of organisms.

phylogeny

n. The evolutionary process of development of a species or other group of organisms.

physical attractiveness

n. The degree to which an individual person or other organism fits criteria of desirability defin...

physiological arousal

n. A bodily state of preparedness to act characterized by high levels of norepinephrine and adren...

physiological psychology

n. The branch of psychology that studies biological processes and their interaction with mental s...

physiology

n. The branch of science that studies the chemistry of biological processes and its interaction w...

physostigmine

n. An alkaloid extracted from the African Calabar bean which has strong cholinergic effects and i...

Piagetian

adj. Of or relating to the person, ideas, or works of Jean Piaget, a Swiss researcher who develop...

Piaget's theory

n. A set of ideas developed by the Swiss physiologist Jean Piaget, who suggested that the human m...

pica

n. An eating disorder of infancy and early childhood in which the child preferentially seeks out ...

pidgin

n. Pidgins are languages that develop in contexts where speakers do not have a common language fo...

pilot study

n. A preliminary version of a research project intended to test the practicality of the intended ...

pineal gland

n. A small cone-shaped gland on the wall of the third ventricle of the brain which secretes melat...

pinna

n. The external part of the ear. Also called auricle.

pivot grammar

n. The structure of language typically used by children during the stage in which most of their s...

PKU

n. (phenylketonuria) The presence of high levels of phenylketones (phenylpyruvic acid) in the uri...

placebo

n. An inactive substance substituted for a drug or a meaningless treatment substituted for an exp...

placebo effect

n. The change in functioning or behavior brought about by the administration of an inert substanc...

planned behavior, theory of

n. The theory of planned behavior (TpB) is a model for predicting behaviors that are not necessar...

planned comparison

n. A comparison of the means of two or more groups in an analysis of variance or regression analy...

planned test

n. A comparison of the means of two or more groups in an analysis of variance or regression analy...

plantar reflex

n. An involuntary extension and spreading of the toes when the sole is appropriately stroked that...

plasticity

n. Malleability, flexibility, or adaptability, especially as applied to the growth and developmen...

platykurtic

adj. Of or relating to a distribution of scores that has more extreme scores and fewer scores nea...

play therapy

n. Any of numerous forms of child therapy in which the child is given an opportunity to play, usu...

pleasant emotions

n. Any pattern of reaction to events that are believed by the individual to be positive with refe...

pleasure center

n. Any of several brain centers which when stimulated in humans are associated with sensations of...

pleasure-pain principle

n. In psychoanalysis, the basic motivation of human nature, which is to obtain the gratification ...

pleasure principle

n. In psychoanalysis, the basic motivation of human nature, which is to obtain the gratification ...

point-biserial correlation

n. (Rb) A measure of relationship between a continuous variable and a dichotomous one scaled so t...

point of subjective equality

n. The intensity of a comparison stimulus that is equally likely to be judged as less intense or ...

Poisson distribution

n. A theoretical data distribution which gives the likelihood of occurrence of relatively rare ev...

polarization

n. 1. A difference in electric potential across a cell membrane such as occurs in nerve and muscl...

politeness ideology

n. A belief system about the observance of accepted social patterns and especially patterns of li...

politeness theory

n. The scientific investigation of the observance and nonobservance of accepted social patterns a...

political participation

n. The degree to which an individual or group acts with an intention of influencing a government ...

political psychology

n. An interdisciplinary branch of psychology that studies political beliefs, attitudes, and parti...

Pollyanna effect

n. The tendency of people to have unrealistically positive expectations, to focus on positive inf...

polyandry

n. The social practice of having more than one husband or mate at the same time. This is uncommon...

polydipsia

n. Prolonged, excessive thirst, often without any physiological need for water. It sometimes occu...

polygamy

n. The practice of having more than one wife or mate at the same time, which has been the most co...

polygenic inheritance

n. Any characteristic passed from one generation to the next which is determined by more than one...

polygyny

n. The practice of having more than one wife or female mate at the same time but not allowing a w...

polysemy

n. The situation in which a word has more than one meaning in the same language. For instance, th...

pons

n. That portion of the brainstem above the medulla oblongata and below the midbrain, which is pri...

Ponzo illusion

n. __\___/__ ___\_/___      \/ A visual illusion in which two identical, parallel lines appea...

population density

n. The number of people within a fixed area of land. Can be computed by determining the ratio bet...

positive afterimage

n. A visual perception after the actual stimulus is gone which is usually in attenuated or altere...

positive correlation

n. A linear relationship between two variables in which one increases as the other increases, as ...

positive feedback

n. 1. Approval, praise, or acceptance received in response to a specific act. 2. An information s...

positive illusion

n. An unrealistically good evaluation, usually of the self, maintained in the face of contrary ev...

positive logical determinism

n. A tendency to see contradictions as mutually exclusive categories, as either-or, yes-no, one-o...

positive psychology

n. Positive psychology is a newly christened approach that takes seriously as a subject matter th...

positive regard

n. Warmth, caring, and acceptance toward another individual, which is often regarded as a necessa...

positive reinforcement

n. 1. A reward or rewarding circumstance following an action which leads to the action's being mo...

positive symptoms of schizophrenia

n. Symptoms that are an addition in the functioning of a typical healthy person. Note that positi...

positive transfer

n. A reduction in the effort or time necessary to learn something due to similar previous learnin...

positivism

n. Any of a number of philosophical approaches in which all ideas are based upon sensory experien...

positivism, logical

n. An archaic philosophy in which spirituality and ethics are rejected as meaningless and the ass...

positron emission tomography

n. (PET) A method of creating images of the insides of bodies including the brain by means of com...

postconventional morality

n. In Kohlberg's theory of moral development, this is the third and highest level of reasoning, c...

posterior probability

n. In statistical inference, the relative frequency of an event inferred from empirical evidence ...

postfigurative culture

n. A culture in which change is slow and socialization occurs primarily by elders' transferring t...

post hoc test

n. A test of the equality of two or more means in an analysis of variance or multiple regression ...

postmodernism

n. Postmodernism refers to a family of late 20th-century intellectual and cultural movements that...

postpartum depression

n. A period beginning shortly after the birth of a child in which a woman begins to have a depres...

postsynaptic membrane

n. The dendritic membrane of a neuron adjacent to the axonic membrane of another neuron, which ha...

postsynaptic neuron

n. A nerve cell which receives input from a particular other nerve cell in the form of neurotrans...

postsynaptic potential

n. A change in the electric potential of the membrane of a nerve cell following reception of neur...

post-traumatic amnesia

n. Inability to store new information and/or retrieve previous information as a result of traumat...

post-traumatic stress disorder

n. (PTSD) An anxiety disorder diagnosable according to the DSM-IV-TR. PTSD occurs in people who h...

poverty of speech

n. An inability to generate spontaneous speech or varied or elaborate responses to questions. Pat...

power

n. 1. The capacity to control, decide, or influence. Social power is usually exercised by control...

power distance

n. The degree of social acceptance of unequal distribution of capacity to control social events, ...

practical intelligence

n. The capacity to deal with problems in everyday life through adapting one's behavior to the env...

practice, distributed

n. A learning procedure in which practice is spread over time with nonpractice intervals between ...

practice effect

n. Increased performance in learning tasks with repeated learning trials.

practice, massed

n. A learning procedure in which all attempts to learn occur consecutively with no time gaps betw...

Prader-Willi syndrome

n. A form of congenital mild to moderate mental retardation resulting from damage to or missing g...

pragmatics

n. In linguistics, the social and behavioral functioning of language communication such as word c...

Pragnanz

n. In Gestalt psychology, the tendency of perceptual systems to form the best and simplest possib...

precentral gyrus

n. The ridge on each side of the brain at the back of the frontal cortex immediately in front of ...

precocious development

n. Abnormally early appearance of skills or abilities usually not developed until later in matura...

precognition

n. In parapsychology, the capacity to know future events before they occur.

preconscious

1. n. (Pcs) In psychoanalysis, thoughts, feelings, or memories which are not presently conscious ...

preconventional morality

n. In Kohlberg's theory of moral development, this is the first and lowest level of reasoning, ch...

predatory aggression

n. A form of aggression in which animals kill other animals for food.

prediction, statistical

n. The process of attempting to foretell the likelihood of future events on the basis of the rela...

predictive validity

 ▶ See VALIDITY, PREDICTIVE

predictor variable

n. A parameter used in a regression or other statistical analysis either to attempt to predict a ...

predisposition

n. 1. In genetics, a chromosomal configuration that makes the development of a particular trait l...

preference

n. 1. The better liking or choice of one option over one or more other options. 2. In learning th...

prefigurative culture

n. A culture that is changing so rapidly that young people may be the ones to teach adults cultur...

prefrontal area

▶ See PREFRONTAL CORTEX

prefrontal cortex

n. Anterior part of the frontal lobes, located in front of the cortical motor areas (primary moto...

prefrontal lobotomy

n. The surgical separation of the prefrontal lobes of the brain from the rest of the brain, which...

preganglionic

adj. Of or relating to efferent neurons in the sympathetic nervous system whose axons connect wit...

prejudice

n. 1. Any judgment arrived at before access to the information necessary to reach such a judgment...

preliterate

adj. 1. Of or relating to any culture that has not developed a written language. 2. Of or relatin...

Premack principle

n. The idea that if any two behaviors are both possible in a given situation and differ in their ...

premenstrual dysphoric disorder

n. An emotional disorder in women characterized by cyclic periods of depressed mood, anxiety, mar...

premenstrual syndrome

n. An emotional disorder in women characterized by cyclic periods of depressed mood, anxiety, mar...

premise

n. A stated idea assumed to be true from which a train of reasoning begins and which is usually n...

premotor cortex

n. Area in the frontal lobe situated in front of the primary motor area (Brodmann's area 4) and b...

prenatal development

n. All growth and elaboration of organic structures in a fetus that takes place from the moment o...

preoperational period

n. In Piagetian psychology, the second stage of intellectual development from approximately 2 to ...

preoperational stage

n. In Piagetian psychology, the second stage of intellectual development from approximately 2 to ...

preoperational thought

n. Thought characteristic of children from 2 to 6 or 7 years of age, in which the child is egocen...

presbyopia

n. An inability to focus on near objects, usually caused by a loss of elasticity in the lens of t...

presenile dementia

n. A general and pervasive loss of cognitive functions such as judgment, memory, and language abi...

press

n. In the motivational theories of Henry Murray, motivation that occurs as a result of environmen...

pressure receptor

n. Any of several kinds of nerve endings that respond to deformation of the shape of the skin or ...

presynaptic

adj. Of or relating to the portion of a nerve cell immediately before the synapse, which contains...

presynaptic neuron

n. Any nerve cell whose depolarization results in the release of neurotransmitters into a particu...

pride

n. An experience of self-satisfaction that occurs when an individual positively evaluates himself...

primacy

n. Being first in a series.

primacy effect

n. The tendency for the first information encountered to be better remembered and to have a great...

primal scene

n. In psychoanalysis, seeing one's parents engaging in sexual intercourse in reality or fantasy.

primary auditory cortex

n. A brain area in the posterior part of the superior temporal gyrus necessary for the conscious ...

primary colors

n. The colors blue, green, and red, from which all other colors can be made by adding various pro...

primary drive

n. An innate motivation to get something or do something which is little affected by circumstance...

primary emotion

n. The basic set of emotional responses of human beings, which commonly is held to include anger,...

primary memory

n. A hypothesized memory store that held only a few items for several seconds in memory theories ...

primary mental abilities

n. The seven factors commonly resulting from factor analysis of intelligence test scores. These h...

primary motor cortex

n. Anterior bank of the central fissure (precentral gyrus), corresponding to the Brodmann's area ...

primary reinforcement

n. A stimulus which increases the likelihood that an act immediately prior to the stimulus will i...

primary sex characteristic

n. A difference between male and female organisms in their genitals or gametes. These contrast wi...

primary somatosensory cortex

n. Anterior part of the parietal lobe (Brodmann's areas 3, 1, and 2), situated behind the central...

primary visual cortex

n. Cortical area of projection of the visual information (V1). It corresponds to the striate cort...

priming

n. Method used to determine whether one stimulus influences another. Typically, a prime word (e.g...

principal-components analysis

n. A form of factor analysis in which the initial communality estimate is set to 1 for each varia...

prisoner's dilemma

n. A game frequently used in game theory in which each player must choose between an option that ...

prisoner's dilemma game

n. A game frequently used in game theory in which each player must choose between an option that ...

private self

n. The part of the self that is known only by the individual himself/herself and is distinguished...

proactive inhibition

n. A lessening or prevention of perception or learning due to the prior presentation of a similar...

proactive interference

n. A lessening or prevention of perception or learning due to the prior presentation of a similar...

probability

n. The likelihood that an event will occur, as opposed to all other possible alternative events.

probability, conditional

n. The likelihood an event will occur, given that another event has occurred.

probability curve

n. A graphic representation of the likelihood of occurrence of different values of a variable.

probability density

n. The likelihood of the outcome of an event falling within a given range.

probability distribution

n. A graphic representation in which the area below a curve at all points and along all segments ...

probability function

n. A mathematical statement giving the relationship between each possible outcome of a situation ...

probability, joint

n. The likelihood that two events will both occur at the same time.

probability matching

n. A form of learning in which an observer attempts to guess which of two or more choices is corr...

probability sample

n. A subset of a population selected by a random selection from the population so that each membe...

probability sampling

n. The technique of selecting a subset of a population by a random selection from the population ...

probability theory

n. The branch of mathematics which deals with the likelihood of different outcomes of events whos...

probe

n. 1. Anything that is used to examine or explore. 2. A question used to explore further in an in...

problem solving

1. n. Cognitive or behavioral processes used to discover solutions to difficulties or to achieve ...

procedural justice

n. Methods and procedures, usually encoded in laws, which are assumed or intended to arrive at fa...

procedural knowledge

n. Being able to do something, as opposed to knowing how to describe how to do something. Thus ma...

procedural memory

n. Being able to do something that one has previously learned to do. This usually involves long-t...

process

n. 1. A sequence of events or actions which leads to an alteration in the state of a system or si...

processing, parallel

n. Data manipulation in which two or more activities analyses are carried out simultaneously and ...

processing, sequential

n. Data manipulation which is carried out in single, usually rapid steps.

product-moment correlation coefficient

n. A numerical index of linear relatedness between two continuous variables scaled so that 0 indi...

professional ethics

n. The rules of socially acceptable conduct which members of a profession are expected to follow ...

profile analysis

n. A multivariate statistical analysis which compares individuals or groups on both the shape of ...

profiling

n. 1. Construction of an outline of likely characteristics of an unknown criminal from the nature...

programmed instruction

n. An approach to teaching in which the material to be taught is broken down into small steps, ea...

progressive matrices test

n. A test of intelligence intended to be fair to persons with different cultural backgrounds and ...

projection

n. This primitive defense mechanism is the unconscious warding off of negative experiences or emo...

projective device

n. This is a personality test that is based on the projective hypothesis, which states that when ...

projective identification

n. In Kleinian analysis, a defensive fantasy in which an individual imagines part of himself/hers...

projective technique

n. An approach to personality assessment techniques that consists of soliciting free responses to...

projective test

n. Any of numerous personality tests which consist of a fixed set of stimuli such as inkblots, pi...

propaganda

n. Persuasive communication that intentionally distorts facts or selects only information support...

propositional knowledge representation

n. Any theoretical model of how the mind works which uses words, images, or relationships as the ...

proprioception

n. The sense of bodily position relative to gravity, acceleration, and the position of one body p...

prosocial behaviors

n. Prosocial behaviors are any actions intended to benefit or help another. These actions may inc...

prosody

n. Prosody refers to the suprasegmental tiers of the phonological structure of an utterance. Pros...

prosopagnosia

n. Neurological disorder characterized by a partial or total inability to recognize faces. It is ...

prospect theory

n. A theory of decision making in which actual human preferences violate statistical utility (1) ...

Protestant work ethic

n. The idea that work and success in worldly affairs are both a moral duty and an indication of G...

prototype

n. 1. In concept formation, a best example of a category which may be a real thing or an abstract...

proverbs test

n. Any test of intelligence, personality, or psychopathology which uses the interpretation of pro...

proxemics

n. The scientific study of personal space including territoriality and crowding. Both individuals...

proximal stimulus

n. The energy which reaches a sense organ from a sense object as opposed to the object itself. In...

proximate compatibility principle

n. In control systems, the idea that information displays work best when a control for a variable...

proximity, law of

n. A Gestalt principle of sensory organization which suggests that in making sense of the world o...

proximodistal

adj. Of or relating to the direction from the center of a body toward the extremities.

proximodistal development

n. A general principle of development in which organs and functions near the center of an organis...

proxy control

n. Refers to control by someone else for the benefit of oneself. This is a form of control that c...

pseudobulbar palsy

n. A paralysis of voluntary movements of the face which leaves involuntary movements such as smil...

pseudodementia

n. A deterioration of cognitive functions similar to those caused by brain damage in the absence ...

pseudohermaphrodite

n. A condition in which a person has the internal sexual organs of one sex and external genitalia...

psychiatrist

n. A medical doctor who specializes in the treatment of psychopathology. Psychiatrists normally s...

psychiatry

n. The medical specialty which focuses on diagnosing and treating psychopathology usually from a ...

psychic determinism

n. The theory that all behavior, thoughts, and emotions have some (often unconscious) meaning or ...

psychoactive

adj. Of or relating to having an effect on the functioning of the mind and the behavior which res...

psychoactive substance

n. Any chemical which has an effect on the functioning of the mind and the behavior which results...

psychoanalysis

n. 1. A form of psychotherapy developed by and based on the theories of Sigmund Freud in which th...

psychoanalyst

n. A psychotherapist who uses the methods of psychoanalysis as his/her therapeutic approach. In t...

psychoanalytic stages

n. The five stages of psychosexual development hypothesized by Sigmund Freud as part of his psych...

psychobabble

n. Superfluous, excessive, and largely meaningless use of psychological terms.

psychobiology

n. 1. A biological approach to psychology which combines physiological and evolutionary perspecti...

psychodrama

n. An approach to psychotherapy in which individuals create plays out of their internal conflicts...

psychodynamic

adj. Of or relating to the psychoanalytic approach in which unconscious motives are a focus.

psychodynamic therapy

n. Psychotherapy that is based on the theories of Sigmund Freud or one of their offshoots which a...

psychoendocrinology

n. The study of psychological and sensory influences which may initiate activity in the endocrine...

psychogalvanic response

n. (GSR) A change in the level or degree to which the skin conducts electricity, which tends to d...

psychogenesis

n. The origin and development of the individual's mind including his or her intelligence and abil...

psychogenic

adj. Of or relating to an origin in the mind.

psychogenic amnesia

n. Loss of memory for personal history or specific events, which is assumed to be caused by menta...

psychoimmunology

n. The study of the interaction of psychological stimulation and responses with immune system rea...

psychokinesis

n. In parapsychology, the ability to move physical objects or control external events by mental e...

psycholinguistics

n. Psycholinguistics is the psychological study of language. Although there are roots in psycholo...

psychological dependence

n. The habitual use of a drug or other behavior pattern as a way of reducing anxiety without actu...

psychological disorder

n. A recognizable pattern of personal distress, abnormal emotional reactions and behavior, cognit...

psychological methods

n. The sum total of all the approaches to psychological research, including conceptual analysis, ...

psychological refractory period

n. (PRP) A period of diminished responsiveness to a stimulus following reaction to a previous sim...

psychological science

n. The use of methods derived from physical sciences in explorations of the functioning of mind a...

psychological test

n. A standardized scale or set of scales used to measure an attribute of mind, usually composed o...

psychological warfare

n. 1. Any attempt to gain advantage in a war by manipulating the minds of either side in the conf...

psychologism

n. 1. The view that psychology is the most important form of intellectual investigation, from whi...

psychologist

n. A person who is trained in psychological research or the clinical practice of psychology and i...

psychology

n. The study of the mind, including consciousness, perception, motivation, behavior, the biology ...

psychometric function

n. Any formal description of the functioning of some aspect of mind and especially as applied to ...

psychometrics

n. A subdiscipline of psychology focusing on the measurement of individual differences across a r...

psychomotor

adj. Of or relating to any relationship between bodily movement and the functioning of mind.

psychomotor agitation

n. Excessive motor movement not directed toward any goal that is characteristic of anxiety or ten...

psychomotor epilepsy

n. A seizure disorder in which there is a complex set of psychological experiences, which may inc...

psychoneuroimmunology

n. The study of the recursive interaction of psychological states, traits, and behavior on the su...

psychopathology

n. 1. The study of mental disorders, including their origin, diagnosis, symptoms, course, associa...

psychopathy

n. An archaic term for a mental disorder characterized by lack of guilt and remorse, impulsivenes...

psychopharmacology

n. The study of the effects of psychoactive drugs and other chemicals on the mind and body with a...

psychophysical function

n. A formal description of the relationships between stimulus characteristics and the perception ...

psychophysics

n. The branch of psychology that studies the relationships between stimulus characteristics and t...

psychosexual development

n. In psychoanalytic theory, the origin and maturation of the mind as it develops, guided by the ...

psychosexual disorder

n. Any sexual disorder with mental rather than physical causes. Also called sexual and gender ide...

psychosexual dysfunction

n. A repetitive or enduring problem in sexual function which has mental rather than physical caus...

psychosexual stage

n. Any of the five stages of development hypothesized by Sigmund Freud as part of his psychoanaly...

psychosis

n. 1. An abnormal mental state in which a person's cognition is sufficiently disturbed so as to b...

psychosocial

adj. Of or relating to both the mind and interaction with other people.

psychosocial stressor

n. Any life situation to which an individual reacts with unusually high levels of tension and anx...

psychosomatic

adj. Of or relating to a belief that the mind is playing a role in creating physical illness or d...

psychosomatic disorder

n. Any type of disorder in which mind and mental functioning affect physical functioning. Also ca...

psychosomatic illness

n. Any physical disorder in which there has been a significant contribution by mind, as in stress...

psychosomatic medicine

n. The branch of medical science which investigates the relationships between social, psychologic...

psychosurgery

n. Any brain surgery done with the intention of remediating psychological disorders. This has inc...

psychotherapist

n. Any person who provides treatment for mental disorders or adjustment problems by means of pers...

psychotherapy

n. The process of relieving mental disorders by psychological means. There are numerous therapeut...

psychotic

adj. Of or relating to being sufficiently disturbed in mental functioning as to lose touch with s...

psychotic depression

n. A state of mind characterized by negative mood, low energy, loss of interest in usual activiti...

psychotic disorder

n. Any disorder in which the person is sufficiently disturbed in mental functioning as to lose to...

psychotomimetic

1. adj. Of or relating to the induction of hallucination. 2. n. Any drug which causes perception ...

psychotropic

adj. Of or relating to having an effect on the functioning of the mind and the behavior which res...

psychotropic drug

n. Any chemical having an effect on the functioning of the mind and on behavior which results fro...

puberty

n. The period of time during which a child's sexual organs mature, secondary sexual characteristi...

puberty rite

n. Any form of initiation or age-specific behavior which a culture deems appropriate for persons ...

public self

n. The self presented to other persons through actions, appearance, social interactions, and self...

Pulfrich phenomenon

n. An optical illusion in which a pendulum swinging perpendicular to the line of sight appears to...

pulvinar

n. The pillow-shaped bulge on the posterior of the thalamus which receives input from the superio...

punctuated equilibrium

n. The theory that evolution tends to proceed by means of short periods of rapid change in specia...

punisher

n. Any stimulus that decreases the likelihood that the behavior that immediately precedes the sti...

punishment

n. The administration of a stimulus that decreases the likelihood that the behavior that immediat...

pupil

n. 1. The opening through which light passes in order to enter the eye, the size of which is alte...

pupillary reflex

n. An involuntary change in the size of opening in the pupil in response to changes in ambient li...

pure hue

n. 1. Light all of a single wavelength. 2. The perception produced by monochromatic light.

pure tone

n. 1. Sound of a single wavelength of air pressure variation. 2. The perception of sound produced...

Purkinje cell

n. A large, flat nerve cell in the cerebellum which can have more than 100,000 connections with o...

Purkinje figure

n. The image of the blood vessels in one's own retina which can occur when a bright light is shin...

Purkinje-Sanson image

n. Any of three reflected images of a brightly lit object at which a subject is looking in a dark...

pursuit movement

n. A smooth tracking of an object by means of eye rotation which allows continuous visual fixatio...

pursuit rotor

n. A laboratory instrument used to test visualmotor coordination in which a small target is embed...

putamen

n. A large reddish structure in the basal ganglia comprising a lateral portion of the lenticular ...

puzzle box

n. A locked container in which an animal is placed which has an unlocking mechanism the animal mu...

p-value

n. P-value, a very common concept in empirical research, refers to the statistical probability th...

Pygmalion effect

n. A form of self-fulfilling prophecy in which the expectations of a leader or person of high soc...

Pygmalionism

n. 1. Falling in love with one's own creation as in Greek myth Pygmalion fell in love with the st...

pyramidal cell

n. A large nerve cell in the cortex shaped like a pyramid which typically has long dendritic bran...

pyramidal tract

n. A set of nerve fibers composed mostly of pyramidal cells whose cell bodies are in the cortex a...

pyromania

n. A mental disorder characterized by a failure to resist impulses to set fires and watch them bu...