Explanations of Perception As if a representation of the premise behind much Gestalt theory, the configuration of the whole in this sculpture is clearly qualitatively different than the sum of its parts. The piece is the cornerstone of the Montreal Neurological Institute. Each child represents a different element of brain functioning. The child on the far left cupping its hands around its eyes illustrates vision. In exploring what kinds of processes lie behind our perceptions, we need to draw on work in four major, and frequently conflicting, traditions that inform modern investigations of perception. These traditions are the Inference Theory (usually associated with the empiricist perspective), the Gestalt Theory (associated with the tradition that emphasized innate tendencies of mind), the Stimulus Theory (associated with the tradition that searches for correspondences between physical and sensory variables and thus sometimes called the psychophysical approach), and, most recently, the Information Processing Approach (in which the metaphor for mind is the digital computer).