All ETDs from UAB

Advisory Committee Chair

Paul D R Gamlin

Advisory Committee Members

Franklin R Amthor

James E Cox

Timothy J Gawne

Rosalyn E Weller

Document Type

Dissertation

Date of Award

2008

Degree Name by School

Doctor of Philosophy (PhD) College of Arts and Sciences

Abstract

Three cues are available to the visual system to determine motion: image displacement across the retina (retinal slip), eye movements, and configuration changes within a scene (Becklen and Wallach, 1985). Any one may lead to the false perception of motion. Induced motion is the illusory movement of one object (or objects) as a result of other movement in the visual field. A wide variety of displays have been used to study induced motion, leading to apparently different classes of induced motion. Current theories of induced motion can be categorized based on local motion, global motion, eye movement suppression, and cognitive processing. Categorizing induced motion based upon the proposed underlying mechanism facilitates the identification of potential brain regions involved in induced motion and thus a better understanding of motion processing. The research here shows that the effect of frontoparallel motion on the perception of motion in depth is similar to that of target and inducing motion in the same plane. Measured illusion strength at different speeds provided evidence for the involvement of specific brain areas and raised questions about the binocular cues responsible. Additional research used two forms of induced motion (motion contrast and capture) as a way to manipulate image velocities independently of the perceived disparity velocity. The results showed that predictions followed those of the binocular cue changing disparity (CD) rather than the prediction of interocular velocity difference (IOVD) and thus ii provide support for changing disparity having a greater relative contribution to the perception of stereomotion.

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