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TL;DR
By studying optic flow in the pigeon, one group has characterized the translation component, and finds that the main axes of the neurons that mediate this response are aligned in the same way as those that are responsible for the rotation component of optic flow.
Abstract
Images on our retinas shift as we turn and move. Such image motions are known as ‘optic flow’, and can be described as rotation around three orthogonal axes, or translation along these same axes. By studying optic flow in the pigeon, one group has characterized the translation component. They find that the main axes of the neurons that mediate this response are aligned in the same way as those that are responsible for the rotation component of optic flow.