quadrantanopia

n. loss of vision in one fourth, or one quadrant, of the visual field. Homonymous quadranopia is the loss of vision in both (upper or lower) quadrants of the same half (right or left) of the visual field of each eye (e.g., left upper quadranopia); it is caused by postchiasmatic brain injury (see postchiasmatic visual deficit). Also called quadranopia; quadrantanopsia; quadrantic hemianopia.

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Psychology term of the day

February 24th 2025

secondary personality

a second discrete identity that repeatedly controls behavior in individuals with dissociative identity disorder. This personality is in sharp contrast to the original, primary personality and generally has a different name as well as dramatically different attitudes, behavior, manner of speaking, and style of dress.