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wavelength The distance between the crests of two successive waves and the major determinant of pitch (for sound) and hue (for light).
Weber fraction In Weber's law, the fraction given by the change in stimulus intensity (DI) divided by the standard intensity (I) required to produce a just-noticeable difference: DI/I = C.
Weber's law The observation that the size of the difference threshold is proportional to the intensity of the standard stimulus.
well-defined problems Problems for which there is a clear-cut way of deciding whether a proposed solution is correct. This contrasts with ill-defined problems, for which it is unclear what a correct solution might be.
Wernicke's area A brain area adjacent to the auditory projection area, damage to which leads to deficits in understanding word meaning.
"what" system The system of visual circuits and pathways leading from the visual cortex to the temporal lobe, especially involved in object identification.
"where" system The system of visual circuits and pathways leading from the visual cortex to the parietal lobe, especially involved in the spatial localization of objects and in the coordination of movements.
white matter Whitish-appearing patches and paths in the brain composed of myelinated axons.
withdrawal symptoms A consequence of drug addiction that occurs when the drug is withheld. These effects tend to be the opposite of those produced by the drug itself.
within-subject comparisons Within the same study, comparing each participant's behavior in one situation to the same participant's behavior in another situation; usually contrasted with between-subject comparisons.
working memory A part of the memory system that is currently activated but has relatively little cognitive capacity.
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