VANDENBERGH EFFECT. See OLFACTION/SMELL, THEORIES OF.
VASCULAR THEORY. See NAFE’S THEORY OF CUTANEOUS SENSITIVITY.
VIBRATION THEORY. See OLFACTION/SMELL, THEORIES OF.
VIBRATORY THEORY OF INHERITANCE. See MENDEL’S LAWS/ PRINCIPLES.
VIERORDT’S LAW. See SKINNER’S DESCRIPTIVE BEHAVIOR/OPERANT CONDITIONING THEORY.
VIGILANCE, THEORIES OF. = sustained attention theories. In general, theories of vigilance refer to the systematic accounts of how observers maintain their focus of attention (i.e., the selective aspects of perception that function to help an organism focus on certain features of the environment to the exclusion of other features) and remain alert to stimuli over prolonged periods of time (i.e., sustained attention; cf: the law of prior entry—the principle that if a subject is attending to one of two possible stimuli, and if they occur simultaneously, the one to which he or she is attending tends to be perceived as having occurred before the other; in social psychology, this is called the prior entry effect where the first impressions of a person tend to dominate and are not easily changed by further acquaintance; Sutherland, 1996; see also Woodworth’s, 1921, laws of attention: selection—of two or more inconsistent responses to the same situation, only one is made at the same time; advantage—one of the alternative responses has an initial advantage over the others due to such factors as intensity and change in the stimulus; shifting—the response that has the initial advantage