The Neural Control of Vision
H. The Function of the Midget and Parasol Channels in Vision

In addition to testing for color, brightness, depth, motion and flicker, animals were also tested for form and texture perception and were also examined under dark adapted conditions. Deficits for form and texture were pronounced after parvo but not after magno lesions. Brightness discrimination under dark adapted conditions was unaffected by either lesion. Based on these findings, the visual functions of the midget and parasol systems are listed in Figure 38.