Document Detail

Does the movement matter? Determinants of the latency of temporally urgent motor reactions.
MedLine Citation:
PMID:  21907332     Owner:  NLM     Status:  Publisher    
BACKGROUND: Extremely rapid movements are frequently executed in response to novel, potentially threatening stimuli. The mechanism by which these sophisticated responses are generated is a topic of debate. The current study investigates: 1) the importance of stimulus-response congruence in rapid responses and 2) the relationship between the autonomic nervous system (ANS) and response time. METHODS: Sixteen participants were seated in a chair that could tilt backwards 13°. Participants were instructed to react as fast as possible in response to either an auditory cue (AUD) or balance perturbation (chair tilt) (PERT) and completed one of three different tasks: reach-to-grasp a fixed handle (FIXED), reach-to-grasp a free moving handle (FREE) or plantar flex the left foot (FOOT). Electromyography and electrodermal activity were recorded. RESULTS: For all tasks, muscle onset latency was shorter and muscle response amplitude was greater following the PERT cue compared to the AUD cue. In contrast, there were no differences in onset latency between motor response conditions. Electrodermal response amplitude was greater in the FIXED and FREE conditions than in the FOOT condition. DISCUSSION: Even in situations where the stimulus was incongruent with the response, muscle onset latencies were evoked faster following the perturbation. The response latencies were determined by stimulus characteristics and the most rapid responses were not reliant on stimulus-response congruence. It remains unclear how it is possible to achieve such rapid response latencies to whole body perturbations but we speculate there may exist similar pathways that are uniquely facilitated by a stimulus dependent ANS response.
Bimal Lakhani; Karen Van Ooteghem; Veronica Miyasike-Dasilva; Sakineh Akram; Avril Mansfield; William E McIlroy
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-8-12
Journal Detail:
Title:  Brain research     Volume:  -     ISSN:  1872-6240     ISO Abbreviation:  -     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-9-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0045503     Medline TA:  Brain Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier B.V. All rights reserved.
Graduate Department of Rehabilitation Science, University of Toronto, 500 University Avenue, Toronto, Ontario, Canada M5G 1V7; Toronto Rehab, 550 University Avenue, Toronto, Ontario, Canada M5G 2A2.
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