Perceptual grouping in the Ternus display: evidence for an 'association field' in apparent motion.

Full Abstract

We present psychophysical experiments designed to reveal the role of facilitative contour interactions (the so-called 'association field') in apparent motion. We use the Ternus display (a trio of horizontally aligned elements oscillating in apparent motion). This display is perceived in 'element' motion when interframe intervals (IFIs) are short, and in 'group' motion when IFIs are long. Using Gabor elements arranged collinearly or in parallel, IFI is varied to find group motion thresholds. Consistent with a role for collinearity in perceptual grouping, thresholds are lower for collinear displays. The collinear vs. parallel comparison is made while manipulating contrast, spatial frequency, eccentricity, phase, orientation jitter and element separation. Results show a clear effect of contrast not observed in lateral masking paradigms or in 'pathfinder' stimuli, with higher contrast promoting within-frame grouping, and evidence of facilitatory interactions among parallel elements (although over a smaller scale). The tendency for collinear displays to group more than parallel displays declined with eccentricity with no clear difference evident at 12 deg. These changes in group motion thresholds indicate changing association strengths among the elements and is accounted for in terms of an association field. Alternative accounts in terms of second-order collector units or visible persistence are considered but are not supported by the data.

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Author information

Author/s: Alais, David (D); Lorenceau, Jean (J);

Affiliation: Unité de Neurosciences Intégratives et Computationnelles, UPR 2191 CNRS, Avenue de la Terrasse, Gif-sur-Yvette 91198, France. david.alais(-atsign-)in.pi.cnr.it

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: Vision research (Vision Res), published in England. (Language: eng)

Reference: 2002-Apr; vol 42 (issue 8) : pp 1005-16

Dates: Created 2002/04/05; Completed 2002/07/12; Revised 2006/11/15;

PMID: 11934452, status: MEDLINE (last retrieval date: 12/26/2008)

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Contrast Sensitivity - physiology
Form Perception - physiology
Humans
Male
Motion Perception - physiology

Orientation
Photic Stimulation - methods
Psychophysics
Sensory Thresholds
Visual Fields - physiology

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