Abstract
A spatial image is a representation of a scene which encodes the spatial location, distance away, surface orientation and movement of each visible surface in the scene. Mental images are spatial images which are held and transformed by a neural network called spatial memory. Spatial memory is a large two-dimensional array of processors called spatial locations which operate in parallel under the control of a single supervising processor. Though held in spatial memory, mental images are independent of it, and can be transformed, shifted and rotated by transforming and moving image parts among the spatial locations. The architecture and control structure of spatial memory are presented as are details of its operation in translating, scaling and rotating mental images of three-dimensional objects. Computer simulations of spatial memory are summarized, and spatial memory is compared with other models of mental imagery.
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