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


stereoscopic depth perceptionTo study stereopsis Bela Julesz random dot stereograms were used as shown in the top part of Figure 35 that create depth similar to those seen in the Magic Eye books. Below it is evident that the parvo lesions, especially at small disparities and high spatial frequencies, produce a sizeable deficit in stereopsis.

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