Figure 4: The response of a radial basis function module, trained on 10 random views of a parametrically defined object, to stimuli differing from a reference view of that object (marked by the big circle), in three ways: (1) by progressive view change, marked by o's; (2) by progressive shape change, marked by x's; (3) by combined shape and view change, marked by *'s. The points along each curve have been sorted by pixel-space distance between the test and the reference stimuli (shown along the abscissa); the units along the ordinate are arbitrary (only the relative response in the three conditions matters). Points are means over 10 repetitions with different random view-space and shape-space directions of change; a typical error bar (+- standard error of the mean) is shown for each curve. Note the insensitivity of the module's output to view-space changes, relative to shape-space changes.