Document Detail

Stimulus significance effects in habituation of the phasic and tonic orienting reflex.
MedLine Citation:
PMID:  15929499     Owner:  NLM     Status:  MEDLINE    
Phasic and tonic measures of electrodermal activity were examined in a simple habituation paradigm, using innocuous visual stimuli. Separate groups were used to investigate the effects of stimulus significance, as manipulated by instructions. One group had no stimulus-related task (indifferent group), while the other was asked to silently count the stimuli to report to the experimenter later (significant group). Prestimulus skin conductance levels were considered as measures of the arousal level at each stimulus presentation, and the subsequent electrodermal responses were taken as the phasic orienting reflex (OR) elicited by each stimulus. Changes in prestimulus arousal were taken as measures of the tonic OR to the experimental series. Marked group differences were found in both phasic and tonic components of the OR. Some, but not all, of the significance effects in the phasic OR were attributable to differences in arousal. The results are discussed in the context of theoretical accounts of the OR.
Robert J Barry
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article    
Journal Detail:
Title:  Integrative physiological and behavioral science : the official journal of the Pavlovian Society     Volume:  39     ISSN:  1053-881X     ISO Abbreviation:  Integr Physiol Behav Sci     Publication Date:    2004 Jul-Sep
Date Detail:
Created Date:  2005-06-02     Completed Date:  2005-10-20     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9105843     Medline TA:  Integr Physiol Behav Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  166-79     Citation Subset:  IM    
Brain & Behaviour Research Institute and Department of Psychology, University of Wollongong, Wollongong, Australia.
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MeSH Terms
Arousal / physiology*
Galvanic Skin Response / physiology*
Habituation, Psychophysiologic / physiology*
Orientation / physiology*
Photic Stimulation
Psychological Theory
Reference Values

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