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Saccade Adaptation and Visual Uncertainty

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posted on 2016-10-04, 11:05 authored by David Souto, Karl R. Gegenfurtner, Alexander C. Schütz
Visual uncertainty may affect saccade adaptation in two complementary ways. First, an ideal adaptor should take into account the reliability of visual information for determining the amount of correction, predicting that increasing visual uncertainty should decrease adaptation rates. We tested this by comparing observers' direction discrimination and adaptation rates in an intra-saccadic-step paradigm. Second, clearly visible target steps may generate a slower adaptation rate since the error can be attributed to an external cause, instead of an internal change in the visuo-motor mapping that needs to be compensated. We tested this prediction by measuring saccade adaptation to different step sizes. Most remarkably, we found little correlation between estimates of visual uncertainty and adaptation rates and no slower adaptation rates with more visible step sizes. Additionally, we show that for low contrast targets backward steps are perceived as stationary after the saccade, but that adaptation rates are independent of contrast. We suggest that the saccadic system uses different position signals for adapting dysmetric saccades and for generating a trans-saccadic stable visual percept, explaining that saccade adaptation is found to be independent of visual uncertainty.

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Citation

Frontiers in Human Neuroscience, 2016, 10:227. doi: 10.3389/fnhum.2016.00227

Author affiliation

/Organisation/COLLEGE OF MEDICINE, BIOLOGICAL SCIENCES AND PSYCHOLOGY/MBSP Non-Medical Departments/Neuroscience, Psychology and Behaviour

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  • VoR (Version of Record)

Published in

Frontiers in Human Neuroscience

Publisher

Frontiers Media

eissn

1662-5161

Acceptance date

2016-04-29

Copyright date

2016

Available date

2016-10-04

Publisher version

http://journal.frontiersin.org/article/10.3389/fnhum.2016.00227/full

Language

en

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