Grouping and Emergent Features in Vision

Grouping and Emergent Features in Vision: Toward a Theory of Basic Gestalts

^{James R. Pomerantz , , Mary C. Portillo1}

Department of Psychology, Rice University

^{Received 14 May 2010; revised 17 March 2011; Accepted 27 March 2011. Available online 7 October 2011.}

 

^{Gestalt phenomena are often so powerful that mere demonstrations can confirm their existence, but Gestalts have proven hard to define and measure. Here we outline a theory of basic Gestalts (TBG) that defines Gestalts as emergent features (EFs). The logic relies on discovering wholes that are more discriminable than are the parts from which they are built. These wholes contain EFs that can act as basic features in human vision. As context is added to a visual stimulus, a hierarchy of EFs appears. Starting with a single dot and adding a second yields the first two potential EFs: the proximity (distance) and orientation (angle) between the two dots. A third dot introduces two more potential EFs: symmetry and linearity; a fourth dot produces surroundedness. This hierarchy may extend to collinearity, parallelism, closure, and more. We use the magnitude of Configural Superiority Effects to measure the salience of EFs on a common scale, potentially letting us compare the strengths of various grouping principles. TBG appears promising, with our initial experiments establishing and quantifying at least three basic EFs in human vision.}

^{Keywords: vision; Gestalts; emergent features; configural; wholes}

^{James R. Pomerantz, Department of Psychology, MS 25, P O Box 1892, Houston, TX 77251-1892}

^{1Mary C. Portillo is now at Department of Social Sciences, University of Houston–Downtown.}

 

http://www.sciencedirect.com/science/article/pii/S0096152311601028

 

 

Ervin Poljac, PhD

Laboratory of Experimental Psychology

University of Leuven (K.U. Leuven)

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Belgium

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fax. +32-16-32.60.99

Email: Ervin.Poljac@psy.kuleuven.be