PSYCH 160A Lecture Notes - Lecture 11: F-Center, Achromatopsia, Color Vision
25 Jan 2020
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Document Summary
V4 has stronger bold response (more activated) during color vision than b&w vision. More activated by color switches than single colors. Is mapped (each v4 maps contralateral half of visual space) All the cortical color centers have wavelength selective neurons. Also respond well (~60% max) to white light. Do not have on/off center surround opponent organization. But do have other extraclassical receptive field properties. Exist in relatively equal proportions for the primary colors. Selective brain damage resulting in achromatopsia is extremely rare. Results from trauma, illness or some other damage to cortical color centers. Caused by a temporary constriction of blood to certain parts of the brain (ex. stroke) May occur without the loss of edges, etc. from color contrast. Color contrast is computed in the ganglion layers. Has been likened by some authors to blindsight for color or an instance of.
