APPARENT DISTANCE
the perceived distance of a specific object from a designated observer. The visual angle subtended by the image of the…
APPARENT MOVEMENT
an illusion of motion or change of size that is cued by visual tricks. For example, a person sitting in…
APPARENT SIZE
the size of a stimulus according to the perceiver. This depends on many factors in addition to the size of…
APPARITION
n. 1. a visual illusion that results from the distortion of a perceived object of some kind. Often interpreted as…
APPEARANCE-REALITY DISTINCTION
the implicit knowledge that the appearance of an object does not necessarily correspond to the reality. For example, a sponge…
APPEASEMENT BEHAVIOR
peaceful actions by one organism that reduce the likelihood of threatening behavior from another organism. This often involves reducing apparent…
APPERCEPTION
n. 1. the process of perceiving something consciously and mindfully. 2. the mental process bv which a perception or an…
APPERCEPTIVE
a base of previously acquired knowledge with which a new perception or idea must be assimilated if it is to…
APPERSONATION
n. an unusual delusion in which the individual believes him- or herself to be another person. The person the assumes…
APPETITE SUPPRESSANTS
pharmacological agents that reduce appetite and may be used to control body weight. They include the amphetamines and other stimulants…
APPETITION SYSTEM
extraversion: as represented by an individual's relative sensitivity to appetitive (positive, rewarding) cues and stimuli and his or her behavioral…
APPETITIVE BEHAVIOR I
an active searching process, performed consciously, that precedes consummatory behavior (see consummaiory response). It is thought to be indicative of…
APPETITIVE CONDITIONING
a type of Pavlovian or classical conditioning in which the unconditioned stimulus is a positive reinforcer that plays to the…
APPETITIVE STIMULUS
In positive reinforcement (see positive reinforcement) this represents an unconditioned stimulus that an organism will approach. The effectiveness of this…