Document Detail

Startle produces early response latencies that are distinct from stimulus intensity effects.
MedLine Citation:
PMID:  16874516     Owner:  NLM     Status:  MEDLINE    
Recent experiments pairing a startling stimulus with a simple reaction time (RT) task have shown that when participants are startled, a prepared movement was initiated earlier in comparison to voluntary initiation. It has been argued that the startle acts to trigger the response involuntarily. However, an alternative explanation is that the decrease in RT may be due to stimulus intensity effects, not involuntary triggering. Thus the aim of the current investigation was to determine if RT simply declined in a linear fashion with increasing stimulus intensity, or if there was a point at which RT dramatically decreased. In the present experiment participants completed 50 active wrist extension trials to a target in response to an auditory stimulus of varying stimulus intensity (83-123 dB). The presented data show that RTs associated with a startle response are separate from stimulus intensity facilitated responses. Furthermore, this startle facilitation is more highly associated with sternocleidomastoid electromyographic (EMG) activity, rather than the EMG from the widely used startle response indicator muscle orbicularis oculi.
Anthony N Carlsen; Chris J Dakin; Romeo Chua; Ian M Franks
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Experimental brain research     Volume:  176     ISSN:  0014-4819     ISO Abbreviation:  Exp Brain Res     Publication Date:  2007 Jan 
Date Detail:
Created Date:  2007-10-18     Completed Date:  2008-01-04     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  199-205     Citation Subset:  IM    
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MeSH Terms
Acoustic Stimulation / methods
Analysis of Variance
Dose-Response Relationship, Radiation
Electromyography / methods
Psychomotor Performance
Reaction Time / physiology*
Startle Reaction / physiology*
Time Factors
Wrist / innervation

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