Potechin, Cindy J (1998) The influence of second-order motion on the induction of vection. Masters thesis, Concordia University.
Optical flow fields composed of spatiotemporal luminance modulations (first-order) versus spatiotemporal contrast modulations (second-order) differ in their ability to induce the illusions of motion aftereffect (MAE) and structure from motion. The inability of second-order (SO) motions to support structure from motion except in response to simple motion stimuli has led to the suggestion that SO motions cannot support computations relating to motion-in-depth. Three experiments were used to determine the ability of first-order (FO) and SO motion stimuli to induce vection, the illusion of 3-D motion induced by image flow. Subjects reported the duration and latency to onset of the MAE and vection illusions in response to stimuli composed of multiplicative combinations of a basic vection signal (radially expanding concentric rings) with three different carriers. The stimulus patterns contained different amounts of FO and SO motion energy (ME). The results indicated that a SO motion signal can induce vection but the vection responses will have slower onsets and shorter durations than those induced by a FO motion signal. As well, the vection response to the SO signal is not the result of contamination by FO artifacts, suggesting that the visual system contains a mechanism specialized for the detection of SO motions and that the activation of these mechanisms is sufficient to induce a sense of self-motion.
|Divisions:||Concordia University > Faculty of Arts and Science > Psychology|
|Item Type:||Thesis (Masters)|
|Authors:||Potechin, Cindy J|
|Pagination:||viii, 109 p. : ill. ; 29 cm.|
|Degree Name:||Theses (M.A.)|
|Thesis Supervisor(s):||Gurnsey, Rick|
|Deposited By:||Concordia University Libraries|
|Deposited On:||27 Aug 2009 17:12|
|Last Modified:||08 Dec 2010 15:15|
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