achromatism

n. color blindness marked by the inability to perceive any color whatsoever: Everything is seen in different shades of gray. It is a congenital condition stemming from a lack of retinal cones. When acquired as a result of brain injury, it is called cerebral achromatopsia; the typical site of injury is the ventromedial occipital cortex of the brain (see V4). Also called achromatopsia. See also dichromatism; monochromatism; trichromatism.

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Psychology term of the day

January 19th 2025

reach envelope

in ergonomics, the area that an operator can reach from a seated or standing position. It is used in workspace design to determine the placement of displays and tools to be used by the operator.