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J Vis. 2004 Oct 13;4(10):838-42.

Second-order motion conveys depth-order information.

Author information

1
The Salk Institute for Biological Studies, La Jolla, CA, USA. jay@salk.edu

Abstract

Psychophysical and neurophysiological studies have revealed that the visual system is sensitive to both "first-order" motion, in which moving features are defined by luminance cues, and "second-order" motion, in which motion is defined by nonluminance cues, such as contrast or flicker. Here we show psychophysically that common types of second-order stimuli provide potent cues to depth order. Although motion defined exclusively by nonluminance cues may be relatively rare in natural scenes, the depth-order cues offered by second-order stimuli arise ubiquitously as a result of occlusion of one moving object by another. Our results thus shed new light on the ecological importance of second-order motion. Furthermore, our results imply that visual cortical areas that have been shown to be responsive to second-order motion may be extracting information not just about object motion as has been assumed, but also about the relative depth of objects.

PMID:
15595889
DOI:
10.1167/4.10.1
[Indexed for MEDLINE]

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