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  The influence of binocular temporal offsets on visual sensitivities

Welchman, A. (2004). The influence of binocular temporal offsets on visual sensitivities. Poster presented at 27th European Conference on Visual Perception (ECVP 2004), Budapest, Hungary.

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Welchman, AE1, 2, Author              
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1Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: Recent neurophysiological data suggest that some binocular neurons are sensitive to both spatial (disparity) and temporal (motion) offsets between the two eyes. Human psychophysics was used to determine whether temporal offsets in binocular stimulus presentation increase noise in stimulus encoding, thus reducing sensitivity. Vernier acuity and stereo acuity were compared, on the assumption that temporal offsets would worsen disparity discrimination, whilst leaving Vernier acuity unaffected. The effects of temporal offsets were examined by measuring discrimination thresholds under four target presentation conditions: continuous (stimulus presented continuously to both eyes for 10 frames/100 ms); alternating (asynchronous binocular presentation for 10 frames; 5 frames per eye); blanking (synchronous binocular presentation, but alternation with a blank screen; 5 frames per eye); and half-continuous (stimulus presented to both eyes for 5 frames). Observers judged whether a target line (45 min of arc × 5 min of arc) was left/right or in-front/behind the fixation cross. Sensitivity (the slope of the psychometric function) was affected by experimental condition, with best performance obtained under continuous presentation. However, no differences were evident between the other three conditions. Further, the pattern of results was the same for Vernier and stereo acuity, suggesting that these results reflect the contrast reduction of temporally interleaved stimuli, rather than effects of temporal offsets per se.

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 Dates: 2004-09
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: 2760
DOI: 10.1068/ecvp04a
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Title: 27th European Conference on Visual Perception (ECVP 2004)
Place of Event: Budapest, Hungary
Start-/End Date: 2004-08-22 - 2004-08-26

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Title: Perception
Source Genre: Journal
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Publ. Info: London : Pion Ltd.
Pages: - Volume / Issue: 33 (ECVP Abstract Supplement) Sequence Number: - Start / End Page: 93 Identifier: ISSN: 0301-0066
CoNE: https://pure.mpg.de/cone/journals/resource/954925509369