June 2006
Volume 6, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   June 2006
Interaction of scene background, size change, direction and velocity in determining perceived motion in depth
Author Affiliations
  • Shaw Gillespie
    University of California, Irvine
  • Myron L. Braunstein
    University of California, Irvine
  • George J. Andersen
    University of California, Riverside
Journal of Vision June 2006, Vol.6, 460. doi:10.1167/6.6.460
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      Shaw Gillespie, Myron L. Braunstein, George J. Andersen; Interaction of scene background, size change, direction and velocity in determining perceived motion in depth. Journal of Vision 2006;6(6):460. doi: 10.1167/6.6.460.

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Abstract

Gibson (1950) contrasted ground theory in which distance judgments are made for objects seen against a continuous background surface with air theory in which isolated objects are seen against a homogeneous background. The present study examined the effects of three sources of distance information with objects displayed against a real world scene background or a uniform background. Observers were presented with two displays in sequence and asked to select the display in which the final position of a spherical object was closer. The object either varied in projected size or maintained a constant size and either moved downward in the projection or moved only horizontally. Objects that moved downward either maintained a constant 3-D velocity or a constant projected velocity. Size change was effective in indicating motion in depth for both background conditions, but the effect of vertical motion was different for the two background conditions. With a homogeneous background, objects moving only horizontally were judged as moving closer and the different velocity functions did not significantly affect judgments. With a scene background, judged motion in depth was smallest for objects moving only horizontally. Objects moving at a constant 3-D velocity were judged as approaching closer than objects moving at a constant projected velocity. These results show an interaction of the presence or absence of a ground surface with size and motion information, with changing size effective independently of the background but the effect of motion direction and velocity strongly dependent on the presence of a scene background.

Gillespie, S. Braunstein, M. L. Andersen, G. J. (2006). Interaction of scene background, size change, direction and velocity in determining perceived motion in depth [Abstract]. Journal of Vision, 6(6):460, 460a, http://journalofvision.org/6/6/460/, doi:10.1167/6.6.460. [CrossRef]
Footnotes
 NIH AG13419-06
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