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Fig. 6.2. Reorganization of receptive fields after a cortical lesion. The receptive fields measured through microelectrode recording before and after lesion in the middle temporal (MT) area of a macaque monkey are shown in visual space; the axes indicate angles in the visual field. The retinal area represented by the lesioned cortex is shown in gray (labeled "Motion scotoma"). Before the lesion, receptive fields of neurons immediately outside the cortical lesion boundary (dashed rounded rectangles) responded to the lower right corner of the gray area. However, 3 hours to 3 days after the lesion, the receptive fields (solid rounded rectangles) became larger and covered a larger portion of the scotoma, suggesting that neurons outside the lesion boundary were compensating for the loss of function. Reprinted with permission from Sober et al. (1997), copyright 1997 by the American Physiological Society.