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labeling theory

n. In sociology, the idea that when a label is attached to a person within a social group, the in...

la belle indifference

n. A French phrase meaning "beautiful indifference," which was used by the French sociologist Emi...

labile personality

n. A pattern of extreme changeability in a person's emotions and adjustment to the world so that ...

labyrinth

n. 1. In anatomy, the network of interconnecting system of cavities and canals within the tempora...

Ladd-Franklin theory

n. An archaic theory of light perception in which it was supposed that there were different photo...

lambda statistic

n. A measure of association between a categorical dependent variable (DV)and an independent varia...

language

n. Language is the implicit system that links an external linguistic signal, acoustic or written,...

language acquisition device

n. The language acquisition device (LAD), or language acquisition system (LAS), is the mental mec...

language development

n. The acquisition of phonology, morphology, lexicon, syntax, semantics, and pragmatics of a lang...

language in great apes

n. 1. The various abilities of bonobos, chimpanzees, gorillas, and orangutans to learn humanlike ...

Lashley jumping stand

n. A small raised stand on which a rat or other small animal was placed and trained to jump towar...

latah syndrome

n. A disorder characterized by hypersensitivity to sudden fright, often accompanied by command ob...

latency

n. 1. A characteristic or period of being present and unseen or unacted but capable of becoming a...

latency period

n. 1. In psychoanalysis, the period of middle childhood during which overt sexuality is latent. D...

latency, response

n. The time delay between a stimulus and a response.

latent content

n. In Sigmund Freud's theory of dreams, the unconscious motivation for a dream, whose energy is c...

latent extinction

n. 1. In operant conditioning, extinction that occurs in the absence of a response, as in placing...

latent inhibition

n. 1. In conditioning, previous exposure to a potential conditioned stimulus without its being pa...

latent learning

n. Learning that occurs through mere exposure without conscious intention, effort, or reinforceme...

latent variable

n. 1. A theoretical construct inferred to underlie observed results. 2. A variable created throug...

lateral dominance

n. Preference in using one side of the body. Also referred to as lateral preference or simply lat...

lateral dorsal nucleus

n. 1. The lateral dorsal nucleus of the geniculate nucleus is a relay center in the main visual p...

lateral eye movement

n. A movement of the gaze to the left or right. This is associated with hemispheric dominance so ...

lateral fissure

n. Fold in the cortex separating the temporal lobe from the parietal and frontal lobes. It is als...

lateral hypothalamic syndrome

n. 1. A pattern of symptoms including failure or inability to eat or drink characteristic of lesi...

lateral hypothalamus

n. The portion of the thalamus away from the center on each side of the brain that is believed to...

lateral rectus

n. The eye muscle on the outside midline of the eye that rotates the eye away from the nose. Also...

Latin square

n. A within-subjects research design in which a square array of letters representing treatments o...

law of effect

n. The statement that rewarded behavior tends to be repeated while behavior that is punished tend...

law of exercise

n. The theory that the repetition of an act makes it more fluid, easier to perform, less prone to...

law of parsimony

n. A scientific principle that places preference on the least complex explanation for an observat...

lay theories of behavioral causality

n. Lay theories of behavioral causality refer to the naive theories laypeople develop and use to ...

leadership

n. Definitions of leadership have changed over the decades. In the 1930s to 1950s, researchers de...

leadership styles

n. Leadership styles are the actual or perceived patterns of behavior (e.g., words and actions) t...

learned flavor aversion

n. An avoidance of a flavor usually associated in the past with illness. The learning of food ave...

learned food/flavor/taste aversion

n. One-trial learning in which an animal learns to avoid a food after it has been sickened and es...

learned helplessness

n. A mental state in which exposure to inescapable shock or other aversive stimuli has produced a...

learning

n. 1. The act or process of acquiring new information, behavior, or skill, which lasts for a cons...

learning, associative

n. Any theory of learning in which it is assumed that learning occurs through the forming of asso...

learning curve

n. Any graphic display of the change in behavior of an organism that alters its behavior in a sit...

learning disability

n. Any difficulty in learning in a specific area of information or performance that is not associ...

learning, implicit

n. Any form of learning that occurs through mere exposure without conscious intention, effort, or...

learning, latent

n. Any form of learning that occurs through mere exposure without conscious intention, effort, or...

learning, motor

n. Any increase in coordination or skill in any bodily motion or complex task, which usually come...

learning, observational

n. Any form of learning that occurs through observation without practice and is not observable un...

learning, one-trial

n. 1. Any form of learning which occurs in a single trial, such as the connection between taste a...

learning, paired associates

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

learning, selective

n. 1. Any form of learning in which some of the available information is learned while other is n...

learning set

n. A form of discrimination learning in which subjects must learn a general rule in order to be s...

learning, S-R

n. An abbreviation for stimulus-response learning, in which an organism learns to respond with a ...

learning, S-S

n. Any form of learning in which one stimulus is associated with another stimulus.

learning, state-dependent

n. Any relatively permanent alteration in mind or behavior that occurs as a reaction to experienc...

learning theories

n. 1. In psychology, any of the theories of the relatively permanent acquisition of information, ...

learning theory, mathematical

n. Any of the behaviorist points of view in which there has been an attempt to describe all learn...

learning to learn

n. A form of discrimination learning in which subjects must learn a general approach to problems ...

learning without awareness

n. Any form of learning that occurs through mere exposure without conscious intention, effort, or...

least-effort principle

n. The observation that organisms will usually try to accomplish a task in a manner requiring the...

least-significant difference test

n. In an experimental design, the computation of all possible pairwise comparisons using a t or F...

least-squares method

n. A technique for estimating the values or the graph of an unknown variable from a number of obs...

lemma

n. In psycholinguistics, a lemma is a level of representation of a word between the semantic (mea...

lens

n. 1. Any mechanism which refracts the light which passes through it in a symmetrical way. Convex...

lens model analysis

n. A data analytic technique to examine human judgments, which is based on assumptions concerning...

leptin

n. A protein secreted by fat cells which is believed to be a messenger chemical that communicates...

lesbian

n. A woman who is attracted to or engages in sexual activity with women rather than with men. Als...

lesion

n. Any damage or structural alteration to a limited area of any organ brought about by disease, t...

level of measurement

n. The form and accuracy of observations. Observations can be recorded in nominal, ordinal, inter...

levels of processing

n. In information processing paradigms, the idea that that there are an ordered series or layers ...

lexical decision task

n. In the lexical decision task participants decide, as quickly and accurately as possible, wheth...

lexicon

n. All the words in a language or all the words an individual is able to use. The size of an indi...

libido

n. 1. In psychoanalysis, the basic biological energy of the person (Eros) directed toward love, s...

lie detection

n. Meta-analysis of hundreds of studies has found that people can detect when others are lying at...

lie scale

n. 1. A scale on the Minnesota Multiphasic Personality Inventory consisting of 15 items which des...

life-span development

n. 1. The predictable, multidimensional changes an individual goes through over the course of gro...

light adaptation

n. The process of becoming accustomed to ambient light levels so as to maximize perception at tha...

likelihood ratio

n. 1. In statistics, the ratio of the likelihood that some fact is true if a condition is true di...

Likert scale

n. Psychometric scale utilizing an item format that requires respondents to indicate their level ...

limbic system

n. A ring-shaped area of the brain around the brainstem involved in emotion, memory, learning, an...

limen

n. 1. A threshold or the magnitude of a stimulus or the change in a stimulus that will be detecte...

limits, method of

n. In psychophysics, a technique for discovering the threshold for a particular stimulus by prese...

linear perspective

n. A cue used to perceive depth in which the size of an image on the retina is used to judge its ...

linear regression

n. A form of statistical modeling in which a set of observations are used to create a line which ...

linguistic determinism

n. The idea that the ways people perceive the world and think are controlled by the language that...

linguistic relativity

n. The linguistic relativity hypothesis consists of a set of ideas proposed by Edward Sapir and B...

linguistics

n. The study of language whose major branches include phonetics, phonology, semantics, syntax, an...

linguistic universals

n. Linguistic universals are facts that are true for all natural languages. Such universal proper...

linkage

n. In genetics, the occurrence of two or more genes on the same chromosome, which makes it more l...

lipid

n. Any of a number of fatty acids and waxes which form one of the major building blocks of living...

lithium

n. A very light malleable silvery alkali metal. In the form of lithium carbonate it is used as a ...

Little Hans

n. The name assigned to a little boy in a published case history in which Sigmund Freud traced a ...

Lloyd Morgan's canon

n. The idea that we should interpret animal behavior as a function of the lowest possible level o...

lobotomy

n. 1. A surgical procedure in which the connections between the frontal lobe and the rest of the ...

lobotomy, prefrontal

n. A surgical procedure in which the connections between the frontal lobe and the rest of the bra...

localization of function

n. The assumption that certain brain areas are responsible for particular kinds of mental functio...

loci, method of

n. A memory technique in which items to be remembered are associated with particular places or pa...

lock-and-key theory

n. The theory that odors are detected when molecules have a particular electrochemical shape that...

locomotor ataxia

n. A progressive difficulty in walking due to the degeneration of the dorsal columns in the spina...

locus

n. The Greek word for "place," locus denotes the position of an anatomical structure, tumor, lesi...

locus of control

n. A phrase coined by Julian Rotter that refers to a person's perception of how much or how littl...

logagnosia

n. An inability to understand words in either spoken or written form. Also called Wernicke's apha...

logic

n. 1. Any mode of analysis that follows an acceptable mode of making inferences from given data. ...

logical positivism

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

logic, formal

n. Logic based on a formally defined system rather than logic based on meanings.

logic, symbolic

n. A system of symbols with formally defined meanings used to analyze the logic of statements or ...

log-linear analysis

n. In statistics, a method of analyzing frequency data in a cross-tabulation by modeling the loga...

logogen

n. A theoretical unit of long-term memory corresponding to a word, digit, or other unit of langua...

logograph

n. Any written system in which a symbol represents a complete word, idea, or morpheme. Thus the C...

logotherapy

n. A form of psychotherapy which focuses on the individual's coming to an understanding of the pe...

longitudinal fissure

n. A deep crevice, running from front to back, between the two halves of the cerebral cortex with...

longitudinal method

n. The experimental process of measuring a variable or variables more than once with the same sub...

longitudinal study

n. Any study which repeats measurements of the same variables with the same subjects spread acros...

long-term memory

n. (LTM) A hypothesized information store in the mind with unlimited capacity, consisting of a po...

long-term potentiation

n. An increased ease of synaptic transmission following brief repeated stimulation of a cell or c...

long-versus short-term orientation

n. A continuum of the time frame for thinking and planning, which describes a culture,s time hori...

looking-glass self

n. The sense of self or identity derived from the communicated impressions, reactions, and opinio...

loosening of associations

n. A symptom of mental disturbance in which mental associations become tangential, thought does n...

lorazepam

n. An addictive central nervous system depressant which is the drug of choice for relief of the s...

lost-letter technique

n. A procedure for measuring attitudes in a geographical area in which two equal sets of letters ...

loudness

n. The experienced intensity of sound, usually measured in phons, which roughly corresponds to it...

love

n. 1. A state of being in which a person is preoccupied with, is unrealistically positive about, ...

love, companionate

n. A love relationship characterized by high levels of intimacy and commitment but lacking passion.

love, romantic

n. A love relationship characterized by high levels of passion and commitment but lacking intimacy.

love scale

n. Any of a large number of measures intended to gauge one person's feelings of connection, commi...

lowball technique

n. A persuasive technique in which a seller offers an unrealistically low price for a desired ite...

low-context cultures

n. Cultures that promote direct communication in which messages are conveyed primarily and direct...

LSD (d iso lysergic acid diethylamide)

n. A powerful psychedelic drug that works primarily by neutralizing a serotonin antagonist. Creat...

lucid dream

n. A dream in which the person is conscious of dreaming and has some sense of control over events...

lumen

n. A unit of subjective light intensity or the illumination equal to the flux of 1 candela of lum...

luminance

n. The amount of light adjusted for human sensitivity emitted or reflected by a surface, usually ...

luminosity

n. The perception of brightness, which is influenced by the total radiance, sensitivity of the ey...

luminosity coefficient

n. A mathematical index of the visibility of light of a particular wavelength. The coefficient is...

luminosity curve

n. A graph showing the intensity of light that is necessary at each wavelength in the visible spe...

luminous flux

n. The rate at which light emitted from or reflected from a source is visible to humans. This dif...

luminous intensity

n. The amount of perceived light or luminous flux emitted or reflected per unit of visible space ...

Luria-Nebraska Neuropsychological Battery

n. (LNNB) A set of tests designed to diagnose general and specific brain dysfunction and to local...

luteotrophic hormone

n. A hormone secreted by the pituitary gland that stimulates the mammary glands to produce and se...

lux

n. A unit of perceived illumination equal to 1 lumen per square meter.

lymph

n. A pale yellow saline fluid resembling blood plasma and white blood cells (leukocytes) that is ...

lymphocyte

n. Any of several types of white blood cells that form part of the immune system that are produce...

lysergic acid diethylamide (d iso)

► See LSD (D ISO LYSERGIC ACID DIETHYLAMIDE)