Abstract
A principle of perceptual organization, calleduniform connectedness (UC), is described, and a theoretical approach to perceptual organization is proposed in which this principle plays a fundamental role. The principle of UC states that closed regions of homogeneous properties—such as lightness, chromatic color, texture, and so forth—tend to be perceived initially as single units. We demonstrate its effects and show that they occur even when opposed by powerful grouping principles such as proximity and similarity. We argue that UC cannot be reduced to such grouping principles, because it is not a form of grouping at all. We then propose a theoretical framework within which UC accounts for the initial (orentry level) organization of the visual field into primitive units. Classical principles of grouping operate after UC, creating superordinate units consisting of two or more basic-level units. Parsing processes also operate after UC, dividing basic-level units into subordinate parts. UC in the retinal image is proposed to be a necessary, but not a sufficient, condition for unit formation, since connected elements on the retina that are perceived to lie in separate depth planes fail to be perceived as units. This fact, together with other evidence that the Gestalt principles of grouping are based onperceived (rather than retinal) relations, suggests that the organization of visual stimulation into UC objects is ultimately achieved within a relatively late, postconstancy representation of environmental surfaces. The implications of this possibility are discussed in light of present theories of visual perception.
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This research was supported in part by National Science Foundation Grant BNS-83-19630 to the first author, a National Institute of Mental Health Research Scientist Award to the second author, and National Institute of Mental Health Grant 1-R01-MH46141 jointly to both authors We wish to thank John Ceraso, Alan Gilchrist, Philip Kellman, Arien Mack, Mary Peterson, James Pomerantz, Anne Treisman. Carl Zuckerman, and an anonymous reviewer for their perceptive Comments on prior drafts of this paper.
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Palmer, S., Rock, I. Rethinking perceptual organization: The role of uniform connectedness. Psychonomic Bulletin & Review 1, 29–55 (1994). https://doi.org/10.3758/BF03200760
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DOI: https://doi.org/10.3758/BF03200760