Aperture induced motion: Illusory motion percepts arising from conflicting terminator and component motion signals
Year: 2010
Type: article
Abstract: When a drifting grating is observed through a stationary circular aperture, the aperture itself will appear to either displace (De Valois & De Valois, 1991) or move (Zhang, Yeh & De Valois 1993; Tse & Hsieh 2006) creating an illusory global motion percept. Here we describe a novel stimulus in which a drifting grating moving behind a stationary rectangular aperture induces an illusory motion percept: Aperture Induced Motion (AIM) that is dependent upon the relationship between terminator and component motion. The stimulus is a variant of that used to demonstrate the Barberpole Illusion (Wallach 1935). When a drifting grating is viewed through a stationary and diagonally-oriented rectangular aperture, either the aperture or the occluders can be observed to move. In a series of motion-nulling and constant-stimuli psychophysics experiments we describe the relationship between the illusory percept and the orientations of the aperture and drifting grating and explore the roles of occlusion, component-motion, trackable features, and contour relationships. Results: The angle between the orientation of the grating, which determines the component motion, and the orientation of the aperture, which determines the terminator motion, is critical in determining the magnitude of the AIM.
Source: Journal of Vision
DOI: 10.1167/7.9.978
Authors: G. P. Caplovitz, P. U. Tse
Institution: Dartmouth College
Language: English
Subfield: Cognitive Neuroscience
Field: Neuroscience
Domain: Life Sciences
Open Access status: gold
Estimated APC paid: $1,850
OpenAlex ID: W2031828364