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

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Marinovic, Welber, Tresilian, James, Chapple, Jack L., Riek, Stephan and Carroll, Timothy J. (2017) Unexpected acoustic stimulation during action preparation reveals gradual re-specification of movement direction. Neuroscience, 348 . pp. 23-32. doi:10.1016/j.neuroscience.2017.02.016

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Official URL: http://dx.doi.org/10.1016/j.neuroscience.2017.02.0...

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Abstract

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.

Item Type: Journal Article
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Divisions: Faculty of Science, Engineering and Medicine > Science > Psychology
Library of Congress Subject Headings (LCSH): Motor ability, Hearing
Journal or Publication Title: Neuroscience
Publisher: Elsevier
ISSN: 0306-4522
Official Date: 21 April 2017
Dates:
DateEvent
21 April 2017Published
17 February 2017Available
8 February 2017Accepted
Volume: 348
Page Range: pp. 23-32
DOI: 10.1016/j.neuroscience.2017.02.016
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Australian Research Council (ARC)
Grant number: DP160102001

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