Altered Triggering of a Prepared Movement by a Startling Stimulus

Carlsen, Anthony N., Hunt, Michael A., Inglis, J. Timothy, Sanderson, David J. and Chua, Romeo (2003) Altered Triggering of a Prepared Movement by a Startling Stimulus. Journal of neurophysiology, 89 4: 1857-1863. doi:10.1152/jn.00852.2002

Author Carlsen, Anthony N.
Hunt, Michael A.
Inglis, J. Timothy
Sanderson, David J.
Chua, Romeo
Title Altered Triggering of a Prepared Movement by a Startling Stimulus
Journal name Journal of neurophysiology   Check publisher's open access policy
ISSN 0022-3077
Publication date 2003-04
Sub-type Article (original research)
DOI 10.1152/jn.00852.2002
Volume 89
Issue 4
Start page 1857
End page 1863
Total pages 7
Place of publication Bethesda, MD
Publisher American Physiological Society
Language eng
Subject 1109 Neurosciences
Abstract Altered Triggering of a Prepared Movement by a Startling Stimulus. J. Neurophysiol. 89: 1857-1863, 2003. An experiment is reported that investigated the effects of an auditory startling stimulus on a compound movement task. Previous findings have shown that, in a targeting task, a secondary movement can be initiated based on the proprioceptive information provided by a primary movement. Studies involving the presentation of a startling stimulus have shown that in reaction time (RT) tasks, prepared ballistic movements could be released early when participants are startled. In the present study we sought to determine whether the secondary component in an ongoing movement task, once prepared, could also be triggered by a startling stimulus. Participants performed a slow active elbow extension (22°/s), opening their hand when the arm passed 55° of extension from the starting point. An unexpected 124 dB startle stimulus was presented 5, 25, or 45° into the movement. Findings showed that, when participants were startled, the secondary component was triggered despite incongruent kinesthetic information. However, this only occurred when the startle was presented late in the primary movement. This suggests that the secondary movement was not prepared prior to task initiation, but was "loaded" into lower brain structures at some point during the movement in preparation to be triggered by the CNS. This occurred late in the movement sequence, but >= 400 ms prior to reaching the target. These findings indicate that, in addition to ballistic RT tasks, a startle can be used to probe response preparation in ongoing compound movement tasks.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Health and Rehabilitation Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 22 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 05 Mar 2009, 12:32:14 EST by Ms Lynette Adams on behalf of School of Health & Rehabilitation Sciences