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  Phase Lags and Gain Ratios in Motion Perception During Smooth Pursuit Eye Movements

Souman, J., & Freeman, T. (2006). Phase Lags and Gain Ratios in Motion Perception During Smooth Pursuit Eye Movements. Poster presented at 9th Tübingen Perception Conference (TWK 2006), Tübingen, Germany.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-D2A9-B Version Permalink: http://hdl.handle.net/21.11116/0000-0006-C4C0-3
Genre: Poster

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 Creators:
Souman, JL1, 2, Author              
Freeman, TCA, Author              
Affiliations:
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, ou_1497794              

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 Abstract: During everyday viewing we rarely keep our eyes still. Our visual system has to take these eye movements into account in order to create a veridical percept of object motion. When we make smooth pursuit eye movements, the perceived velocity of a moving object can be obtained by summing two signals, one estimating retinal image velocity and the other estimating eye velocity. Previous studies have shown that the gains of these two signals differ. Here we investigate whether they also differ in their latencies. Observers compared the peak velocity of sinusoidally moving dot patterns viewed during sinusoidal smooth pursuit eye movements and during fixation. The relative gains and phases of the two signals were estimated from the amplitude matches by fitting a simple linear model. At VSS2005, we showed that the model described the data well for most observers, but the estimated signal gains and phases showed considerable variability. Also, the gain ratio was very low for most observers, suggesting they ignored eye-velocity information and judged instead the relative motion in the display. Here, we tested whether removing the vertical edges in the stimulus window, using a large-field cylindrical screen, promoted head-centred judgements. Using this display, observers seem more able to judge head-centred sinusoidal motion consistently during smooth eye pursuit. Relative signal gain was comparable to that previously reported in the literature. Moreover, the results suggest that retinal motion signals lag eye-movement signals by a small amount.

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 Dates: 2006-03
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: BibTex Citekey: 4846
 Degree: -

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Title: 9th Tübingen Perception Conference (TWK 2006)
Place of Event: Tübingen, Germany
Start-/End Date: 2006-03-03 - 2006-03-05

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Title: 9th Tübingen Perception Conference: TWK 2006
Source Genre: Proceedings
 Creator(s):
Bülthoff, HH1, Editor            
Gillner, S, Editor            
Mallot, HA, Editor            
Ulrich, R, Editor
Affiliations:
1 Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794            
Publ. Info: Kirchentellinsfurt, Germany : Knirsch
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 164 Identifier: ISBN: 3-927091-73-1