Motion induced transformations of spatial representations: Mapping 3d information onto 2d

Spatial positions of objects are represented by ''clouds of activation'' in a neural grid. In a moving frame these clouds provide a stable representation of objects in the inertial coordinate system. Relative motion of the activation pattern is realized by creation and deletion of activity along three axes of the neural grid. First results are reported from simulations of a system with one rotatory and two translatory degrees of freedom. It is easy to extend the system to six degrees of freedom without changing the theory. A three-dimensional version of the system in head fixed polar coordinates is discussed. The three-dimensional neural structure, required for three-dimensional activation patterns, can be mapped to a two-dimensional layer of neurons. This mapping of 3D information onto a 2D network implies a very typical architecture, predicting many details of biological brain structures.

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