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    An MEG study of response latency and variability in the human visual system during a visual-motor integration task


    Tang, Akaysha and Pearlmutter, Barak A. and Hely, Tim A. and Zibulevsky, Michael and Weisend, Michael P. (2000) An MEG study of response latency and variability in the human visual system during a visual-motor integration task. In: Advances in Neural Information Processing Systems 12 : Proceedings of the 1999 Conference. MIT Press, pp. 185-191. ISBN 9780262194501

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    Abstract

    Human reaction times during sensory-motor tasks vary considerably. To begin to understand how this variability arises, we examined neuronal populational response time variability at early versus late visual processing stages. The conventional view is that precise temporal information is gradually lost as information is passed through a layered network of mean-rate \units." We tested in humans whether neuronal populations at different processing stages behave like mean-rate \units". A blind source separation algorithm was applied to MEG signals from sensory-motor integration tasks. Response time latency and variability for multiple visual sources were estimated by detecting single-trial stimulus-locked events for each source. In two subjects tested on four visual reaction time tasks, we reliably identified sources belonging to early and late visual processing stages. The standard deviation of response latency was smaller for early rather than late processing stages. This supports the hypothesis that human populational response time variability increases from early to late visual processing stages.

    Item Type: Book Section
    Additional Information: Postprint version of published article.
    Keywords: MEG Study; Response Latency; Variability; Human Visual System; Visual-Motor Integration Task;
    Academic Unit: Faculty of Science and Engineering > Computer Science
    Item ID: 8133
    Depositing User: Barak Pearlmutter
    Date Deposited: 07 Apr 2017 15:36
    Publisher: MIT Press
    Refereed: Yes
    URI:

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