Fig. 4.

Recording sites and receptive fields in MT of an animal with a V1 lesion (case #7). The sections (left of each panel) correspond to a plane slightly tilted from coronal. The MT cortex is shown magnified, with the location of recording sites obtained in an electrode penetration (circles and crosses) indicated. Black circles indicate cells with weakly or nonhabituating responses, white circles indicate cells with strongly habituating responses, and crossesindicate cells that did not respond to the stimuli used. The borders of MT are indicated by dashed lines. The locations of these electrode penetrations, projected to two-dimensional maps of MT, are indicated by the dotted lines in the top left diagrams. The diagrams on theright of each panel illustrate a portion of the animal's visual field, with the extent of the scotoma shown ingray and receptive fields indicated byrectangles or ovals. The preferred direction of motion of each cell is indicated next to its designation (cell h responded equally well to movement in all directions).