conditioned food aversion

n. Food that has been paired with digestive distress or other negative stimuli will tend to be avoided by the organism in the future. When the aversive stimulus is digestive distress, this is an instance of one form of trial learning which is a special case, in which learning curves do not follow normal, gradual patterns of acquisition and extinction but are acquired in a single trial and have marked resistance to extinction. This contradicts the supposition in much of behaviorism that stimuli and responses are essentially equal.