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Open AccessFeature PaperArticle

Investigating Human Visual Sensitivity to Binocular Motion-in-Depth for Anti- and De-Correlated Random-Dot Stimuli

1
School of Psychology and Neuroscience, University of St Andrews, St Andrews KY16 9JP, UK
2
Department of Psychology, University of York, York YO10 5DD, UK
3
School of Optometry and Vision Science, University of Bradford, Bradford BD7 1DP, UK
*
Author to whom correspondence should be addressed.
Current address: School of Psychology, University of Aberdeen, Aberdeen AB24 3FX, UK
Vision 2018, 2(4), 41; https://doi.org/10.3390/vision2040041
Received: 17 September 2018 / Revised: 26 October 2018 / Accepted: 29 October 2018 / Published: 1 November 2018
Motion-in-depth can be detected by using two different types of binocular cues: change of disparity (CD) and inter-ocular velocity differences (IOVD). To investigate the underlying detection mechanisms, stimuli can be constructed that isolate these cues or contain both (FULL cue). Two different methods to isolate the IOVD cue can be employed: anti-correlated (aIOVD) and de-correlated (dIOVD) motion signals. While both types of stimuli have been used in studies investigating the perception of motion-in-depth, for the first time, we explore whether both stimuli isolate the same mechanism and how they differ in their relative efficacy. Here, we set out to directly compare aIOVD and dIOVD sensitivity by measuring motion coherence thresholds. In accordance with previous results by Czuba et al. (2010), we found that motion coherence thresholds were similar for aIOVD and FULL cue stimuli for most participants. Thresholds for dIOVD stimuli, however, differed consistently from thresholds for the two other cues, suggesting that aIOVD and dIOVD stimuli could be driving different visual mechanisms. View Full-Text
Keywords: motion-in-depth; 3D motion; binocular cues; disparity; CD; IOVD; anti-correlation; de-correlation motion-in-depth; 3D motion; binocular cues; disparity; CD; IOVD; anti-correlation; de-correlation
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Giesel, M.; Wade, A.R.; Bloj, M.; Harris, J.M. Investigating Human Visual Sensitivity to Binocular Motion-in-Depth for Anti- and De-Correlated Random-Dot Stimuli. Vision 2018, 2, 41.

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