extraspectral hue

a hue composed of a mixture of wavelengths, and thus not falling along the visible spectrum (compare spectral color). Two examples are purple and white: Purple is a mixture of long and short wavelengths, whereas white is a mixture of all wavelengths. Also called nonspectral hue.

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Psychology term of the day

October 18th 2024

Fechner’s paradox

the apparent increase in the brightness of a figure caused by closing one eye after viewing the figure with both eyes open. [Gustav Theodor Fechner]