title: Evolving concepts of spatial channels in vision: from independence to nonlinear interactions.
abstract: By the 1960s it was evident from neuroanatomy that there were extensive recurrent interactions, both excitatory and inhibitory, among visual cortical neurons. Nevertheless, the psychophysical discovery of 'spatial-frequency channels' gave rise to a decade in which parallel, independent channels were thought to subserve early spatial vision. Recent work, however, has clearly demonstrated that early visual channels do not perform a Fourier or wavelet decomposition of the image. Instead, they interact through a variety of nonlinear pooling mechanisms. Such nonlinear interactions perform important computations in texture perception, stereopsis, and motion and form vision.
authors.affiliation: Visual Sciences Center, University of Chicago, IL 60637, USA. hrw6@midway.uchicago.edu
authors.forename: H R
authors.initials: HR
authors.lastname: Wilson
authors.forename: F
authors.initials: F
authors.lastname: Wilkinson
mesh_terms: D003867:Depth Perception / Q000502:physiology; D005556:Form Perception / Q000502:physiology; D006801:Humans; D009039:Motion Perception / Q000502:physiology; D009474:Neurons / Q000502:physiology*; D017711:Nonlinear Dynamics; D011594:Psychometrics; D011601:Psychophysics; D014793:Visual Cortex / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*