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    Unexpected acoustic stimulation during action preparation reveals gradual re-specification of movement direction

    261506.pdf (3.632Mb)
    Access Status
    Open access
    Authors
    Marinovic, Welber
    Tresilian, J.
    Chapple, J.
    Riek, S.
    Carroll, T.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Marinovic, W. and Tresilian, J. and Chapple, J. and Riek, S. and Carroll, T. 2017. Unexpected acoustic stimulation during action preparation reveals gradual re-specification of movement direction. Neuroscience. 348: pp. 23-32.
    Source Title
    Neuroscience
    DOI
    10.1016/j.neuroscience.2017.02.016
    ISSN
    0306-4522
    School
    School of Psychology
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP160102001
    URI
    http://hdl.handle.net/20.500.11937/63437
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 IBRO. A loud acoustic stimulus (LAS) is often used as a tool to investigate motor preparation in simple reaction time (RT) tasks, where all movement parameters are known in advance. In this report, we used a LAS to examine direction specification in simple and choice RT tasks. This allowed us to investigate how the specification of movement direction unfolds during the preparation period. In two experiments, participants responded to the appearance of an imperative stimulus (IS) with a ballistic wrist force directed toward one of two targets. In probe trials, a LAS (120 dBa) was delivered around the time of IS presentation. In Experiment 1, RTs in the simple RT task were faster when the LAS was presented, but the effect on the movement kinematics was negligible. In the Choice RT task, however, movement direction variability increased when the LAS was presented. In Experiment 2, when we primed movements toward one direction, our analyses revealed that the longer participants took to start a movement, the more accurate their responses became. Our results show not only that movement direction reprogramming occurs quickly and continuously, but also that LAS can be a valuable tool to obtain meaningful readouts of the motor system's preparatory state.

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