Document Detail

Determinants of tonic and phasic reactions in transswitching.
MedLine Citation:
PMID:  3748634     Owner:  NLM     Status:  MEDLINE    
Forty-eight college students were assigned randomly to four groups in a 2 X 2 factorial arrangement of phasic conditional stimuli (same vs. different) and tonic conditional stimuli (same vs. different) to receive 2 days of classical conditioning with a transswitching procedure. Tonic stimuli were a 5-minute projected white triangle or circle; phasic stimuli were a 5-second red or green square superimposed over the tonic stimuli. There were six tonic stimulus segments each day, separated by 20-second periods of no stimulus, three containing six trials of the phasic stimulus paired with shock and three containing six trials of the phasic stimulus alone, in the counterbalanced order. Tonic responding at the onset of the tonic stimuli or during brief periods following its onset were recorded, along with phasic responses to the phasic stimuli. Responses included magnitude of skin conductance responses, frequency of unelicited skin conductance responses, and tonic heart rate. Both skin conductance measures of responding to the tonic stimuli differentiated significantly between positive and negative tonic segments during Day 2, but only in the group with two different tonic stimuli and one phasic stimulus ("standard" transswitching). This supported the hypothesis that tonic stimulus differentiation would be absent when two different phasic stimuli were present. The heart rate data did not support this hypothesis, showing tonic differentiation in both groups with two tonic stimuli. Phasic differentiation controlled by the different phasic stimuli was observed on Day 1; on Day 2, phasic differentiation was present only in the group with two tonic and one phasic stimuli and the group with one tonic and two phasic stimuli.(ABSTRACT TRUNCATED AT 250 WORDS)
M R Murrin; H D Kimmel
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  The Pavlovian journal of biological science     Volume:  21     ISSN:  0093-2213     ISO Abbreviation:  Pavlov J Biol Sci     Publication Date:    1986 Jul-Sep
Date Detail:
Created Date:  1986-10-15     Completed Date:  1986-10-15     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0414243     Medline TA:  Pavlov J Biol Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  117-23     Citation Subset:  IM    
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MeSH Terms
Conditioning, Classical / physiology*
Galvanic Skin Response
Heart Rate
Photic Stimulation
Reaction Time / physiology*
Time Factors
Visual Pathways / physiology*

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