Abstract
1. 1. Multisensory control of eyestalk orientation is reviewed in the light of studies of eye movements of freely moving crabs. 2. 2. During locomotion, the eyes of freely moving crabs compensate for the rotatory but not the translatory components of visual flow. 3. 3. It is argued that, since only the rotatory component can be used for course control, while only the translatory component provides information on ground speed and the three dimensional layout of the environment by means of motion parallax, this separation of flow field components makes good functional sense.
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