Separating processes in object perception.

In this article, I consider research by Needham and colleagues examining the role of object knowledge on infant's segregation of scenes into objects. I suggest that research in this area would benefit from closer connections to computational, psychophysical, and neurophysiological research on adult perceptual segmentation and grouping. I sketch a framework for understanding the components of object perception and apply it to the paradigm and displays used by Needham. This analysis suggests two ideas. First, it would be valuable to demonstrate the role of object knowledge in cases that are less impoverished in terms of perceptual information for segregation and more typical of object arrangements in ordinary scenes. Second, some method is needed to distinguish whether infants' object knowledge affects perceptual organization of new scenes or produces specific beliefs, inferences, or expectations about particular objects and scenes. As a specific example of the benefits of connecting developmental and adult research, some recent research in adult perception is described. The research indicates that in adult object segregation, two types of processes may be distinguished: basic perceptual processes of object segregation and more cognitive processes involving recognition. I suggest that Needham's research may be revealing the developmental origins of the latter processes.