Visual processing in the primate parietal lobe
The evidence for the coding of visual location in multiple ways within the dorsal stream, for different motor purposes, is becoming increasingly clear. But all of these forms of spatial coding, of course, would only be of value over rather short time spans, since every time the animal moved its body, the usefulness of the coding would be lost. In other words, any form of egocentric spatial coding would be useful for guiding action in the present, but not for storing spatial information for use very far in the future. It would provide useful information about object location for calibrating the amplitude and direction of an immediate movement of the eye, head, or limb, but not for the long-term storage of information about the relative location of that object vis-a-vis other objects in the world.
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