When does grouping happen?

  • Palmer S
  • Brooks J
  • Nelson R
  • 112


    Mendeley users who have this article in their library.
  • 86


    Citations of this article.


Recent research on perceptual grouping is described with particular emphasis on identifying the level(s) at which grouping factors operate. Contrary to the classical view of grouping as an early, two-dimensional, image-based process, recent experimental results show that it is strongly influenced by phenomena related to perceptual constancy, such as binocular depth perception, lightness constancy, amodal completion, and illusory contours. These findings imply that at least some grouping processes operate at the level of phenomenal perception rather than at the level of the retinal image. Preliminary evidence is reported showing that grouping can affect perceptual constancy, suggesting that grouping processes must also operate at an early, preconstancy level. If so, grouping may be a ubiquitous, ongoing aspect of visual organization that occurs for each level of representation rather than as a single stage that can be definitively localized relative to other perceptual processes. © 2003 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Amodal completion
  • Binocular depth perception
  • Grouping
  • Illusory contours
  • Lightness constancy
  • Perceptual constancy
  • Perceptual organization

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document


  • Stephen E. Palmer

  • Joseph L. Brooks

  • Rolf Nelson

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free