Abstract
Subsequent to the experiment described in Part I, the röle of spatial-surround cues is further investigated by attempting to modify the character of the environment. Pairs of shapes are matched, both stationary and rotating, within an Ames-type equivalent space. These shapes are of two kinds. The first is calculated for normal perceptual space, and the second pair are comparable only in the equivalent space. Comparison of matchings indicates that the perceived shape is a product of interaction between cues emanating from the object and the surround, in terms of which the object cues are evaluated, though the concept of “anchorage” or “reference frame” is distinguished from suggestions advanced by some authors.
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