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    Corticospinal excitability during preparation for an anticipatory action is modulated by the availability of visual information

    Access Status
    Open access via publisher
    Authors
    Marinovic, Welber
    Reid, C.
    Plooy, A.
    Riek, S.
    Tresilian, J.
    Date
    2011
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Marinovic, W. and Reid, C. and Plooy, A. and Riek, S. and Tresilian, J. 2011. Corticospinal excitability during preparation for an anticipatory action is modulated by the availability of visual information. Journal of Neurophysiology. 105 (3): pp. 1122-1129.
    Source Title
    Journal of Neurophysiology
    DOI
    10.1152/jn.00705.2010
    ISSN
    0022-3077
    School
    School of Psychology and Speech Pathology
    URI
    http://hdl.handle.net/20.500.11937/50361
    Collection
    • Curtin Research Publications
    Abstract

    To intercept rapidly moving objects, people must predict the right time to initiate their actions. The timing of movement initiation in interceptions is thought to be determined when a perceptual variable specifying time to contact reaches a criterion value. If a response needs to be aborted, the performer must make a decision before this moment. It has been recently shown that the minimal time to suppress an anticipatory action takes longer during motion extrapolation than during continuous visual information. In experiment 1, we sought to determine whether or not the availability of visual information would 1) affect the latency to inhibit an anticipatory action, and 2) modulate the level of excitability in the motor cortex (M1). The behavioral results showed that the absence of visual information prolonged the latency to stop the movement as previously reported. The neurophysiological data indicated that corticospinal excitability levels were affected by the availability of visual information. In experiment 2, we sought to verify whether corticospinal excitability levels would also differ between the two visual conditions when the task did not involve response suppression. The results of experiment 2 indicated that excitability levels did not differ between visual conditions. Overall, our findings indicated that the buildup of motor activation can also play a role in determining different latencies to inhibit an anticipatory action. They also suggest that the buildup of motor activation in the corticospinal pathways can be strategically modulated to the requirements of the task during continuous visual information.

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