Glossary

	Psychology: Concepts and Applications 3e Halonen
	Online Learning Center

validity
	The concept that tests actually measure what they are supposed to measure (Ch. 9)

variable
	Behaviors, events, or other characteristics that can change, or vary, in some way (Ch. 2)

variable-interval schedule
	A schedule whereby the time between reinforcements varies around some average rather than being fixed (Ch. 6)

variable-ratio schedule
	A schedule whereby reinforcement occurs after a varying number of responses rather than after a fixed number (Ch. 6)

variability
	The spread, or dispersion, of scores in a distribution (App.)

visual illusions
	Physical stimuli that consistently produce errors in perception (Ch. 4)

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