subsystems involved in certain cognitive processes such as spatial attention (Posner,
Walker, Friedrich, & Rafal, 1984) and imagery (Farah, 1988; Kosslyn, 1986). In this article we
discuss neuropsychological evidence that suggests a modular system is responsible for the
organization of parts and wholes by the visual system. We review both normal and
neuropsychological evidence that suggest that hierarchical organization of objects within …