June 2006
Volume 6, Issue 6
Free
Meeting Abstract  |   June 2006
Perception of stereomotion coherence in the presence of planar or volumetric dynamic noise
Author Affiliations
  • Finnegan J. Calabro
    Brain and Vision Research Lab, Department of Biomedical Engineering, Boston University, Boston, MA, USA
  • Lucia M. Vaina
    Brain and Vision Research Lab, Department of Biomedical Engineering, Boston University, Boston, MA, USA, and Harvard Medical School, Department of Neurology, Boston, MA, USA
Journal of Vision June 2006, Vol.6, 624. doi:10.1167/6.6.624
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      Finnegan J. Calabro, Lucia M. Vaina; Perception of stereomotion coherence in the presence of planar or volumetric dynamic noise. Journal of Vision 2006;6(6):624. doi: 10.1167/6.6.624.

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      © 2015 Association for Research in Vision and Ophthalmology.

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Abstract

The visual motion system can use disparity to segment a signal from noise (Snowden, Rossiter 1999). Here we use a stereomotion coherence task to examine how properties of segmentation vary as a function of disparity. Experiments: Subjects performed a left/right motion discrimination task. In Exp 1, a plane of signal dots was at fixation while the depth of a noise plane varied (0'–12'); In Exp 2 the signal plane was placed at +/−10'; in Exp 3 the noise plane was replaced by a 3D cloud of variable depth. Results: Exp 1: As expected, subjects' thresholds improved dramatically as disparity separation increased. Exp 2: For crossed disparities, motion discrimination thresholds were higher for noise in front of the signal, indicating that segmentation was more difficult. Exp 3: For signal planes at a fixed distance from the cloud thresholds remained constant, suggesting that the distance to the cloud, but not the depth of the cloud, had a strong effect on performance. The results of Experiments 2 and 3 show that the perception of motion when noise was a 3D cloud produced lower thresholds than when the noise was 2D (both were 2' from the signal plane). Conclusions: Taken together these results suggest a channel model which weights each noise dot by its distance from the signal. The model allows for estimates of disparity channel tuning widths as a function of depth. However, the near/far asymmetry we report requires a low-pass channel for crossed disparities without a corresponding channel for uncrossed disparities.

Calabro, F. J. Vaina, L. M. (2006). Perception of stereomotion coherence in the presence of planar or volumetric dynamic noise [Abstract]. Journal of Vision, 6(6):624, 624a, http://journalofvision.org/6/6/624/, doi:10.1167/6.6.624. [CrossRef]
Footnotes
 Supported by NIH grant R01EY007861-15 to L.M.V.
© 2006 ARVO
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