| Abstract: | After habituation of looking at an object that repeatedly approached and receded through 50 cm along the medial axis, 30 infants (16.1–19.6 wks old) were presented with both the same moving object and one of a different size falling within the same range of visual angles as those projected during habituation. The starting point for movement varied widely from trial to trial to "desensitize" Ss to a range of changing distances and visual angles. Recovery from habituation of looking was greater for the moving object of a different size than for the same object, indicating that Ss perceived an object's invariant size with changing visual angle (i.e., that visual size constancy was operative). A secondary finding was that following habituation to the smaller object there was a markedly greater recovery with the larger object than with the smaller, but following habituation with the larger one there was no difference between their recovery. Outcomes were attributed to the additive effects of object salience and recovery from habituation. (11 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved) |
