Cyclopean discrimination thresholds for the direction and speed of motion in depth

Vision Research
C V Portfors-Yeomans, D Regan

Abstract

We measured just-noticeable differences in the direction and speed of motion in depth of cyclopean and monocularly visible targets. Our stimulus set comprised different combinations of (d phi/dt)/(d delta/ dt), d delta/dt, d phi/dt and delta delta, where d phi/dt was the angular frontal plane speed of the binocularly-fused target, d delta/dt was its rate of change of disparity and delta delta was its disparity displacement. Our three subjects based their direction discriminations entirely on the task-relevant variable (d phi/dt)/(d delta/dt), and based their speed discriminations entirely on the task-relevant variable d delta/dt. They ignored all task-irrelevant variables in both tasks. Performance on both tasks was the same for motion within the horizontal and vertical meridians. Direction discrimination threshold rose significantly as the reference direction grew more oblique with respect to a line passing midway between the eyes and perpendicular to the frontal plane. Performance on the direction discrimination task was significantly better for the noncyclopean than for the cyclopean target, but the difference was not great. For the cyclopean target, the lowest value of the direction discrimination threshold was 0.70 deg (me...Continue Reading

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Citations

Dec 6, 2005·Experimental Brain Research·E PoljacA V van den Berg
Feb 26, 2000·Trends in Cognitive Sciences·I Regan, I Gray
Nov 3, 2005·Journal of Experimental Psychology. Human Perception and Performance·Rob Gray, Randy Sieffert
Nov 19, 1997·Proceedings. Biological Sciences·M F Bradshaw, B G Cumming
May 12, 2012·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·David Regan
Nov 2, 2006·Perception & Psychophysics·Kristen L MacugaJonathan W Kelly
Jan 25, 2003·Journal of Experimental Psychology. Human Perception and Performance·Kevin R Brooks
Jul 3, 2008·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Satoshi ShioiriHirohisa Yaguchi
Apr 11, 2000·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·J H Sumnall, J M Harris
Jan 1, 2000·Vision Research·R Patterson
Nov 24, 2001·Vision Research·D Regan, R Gray
May 26, 1999·Vision Research·R P Kohly, D Regan
Jul 19, 2005·Vision Research·Julian Martin Fernandez, Bart Farell
Oct 22, 2003·Vision Research·Martin LagesErich W Graf
Apr 4, 2000·Vision Research·R Gray, D Regan
May 20, 2004·Vision Research·Andrew E WelchmanJulie M Harris
Jan 17, 2009·Vision Research·Simon K Rushton, Philip A Duke
Aug 26, 2000·Vision Research·S ShioiriH Yaguchi
Mar 30, 2010·Vision Research·Cristina de la Malla, Joan López-Moliner
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Feb 16, 2011·Perceptual and Motor Skills·Kevin R Brooks, Leland S Stone
Jul 24, 2001·Perception·K Brooks
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Sep 7, 2017·Proceedings of the National Academy of Sciences of the United States of America·Xue-Xin Wei, Alan A Stocker
Oct 1, 2010·Journal of Neurophysiology·Thaddeus B CzubaLawrence K Cormack
Jul 27, 2017·Annual Review of Vision Science·Lawrence K CormackAlexander C Huk

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