Document Detail


Effects of S+ and S- separation on gradient shifts in humans.
MedLine Citation:
PMID:  16705909     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Following single stimulus training, responding during a generalization test tends to be distributed around the positive stimulus (S+). However, if participants are trained instead to discriminate the S+ from a negative stimulus (S-), the response gradient often shifts away from the S- and toward the opposite end of the stimulus continuum. In this experiment, the author examined the basis of gradient shifts with 72 college undergraduates. The research especially examined how gradient shifts are affected by the physical similarity of the S+ and the S- and by the ease with which the two stimuli can be compared. For the former manipulation, the author randomly assigned participants to either a control condition in which only the S+ was shown or a discrimination condition in which the S- was either near to or far from the S+ on the continuum. For the latter manipulation, the author randomly assigned participants to a condition in which S+ and S- presentations were separated by intervals of 1, 15, or 30 s. The results showed that marked shifts occurred when the S+ and S- were relatively similar, but temporal separations did not affect responding.
Authors:
Adam Derenne
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of general psychology     Volume:  133     ISSN:  0022-1309     ISO Abbreviation:  J Gen Psychol     Publication Date:  2006 Apr 
Date Detail:
Created Date:  2006-05-18     Completed Date:  2006-09-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985111R     Medline TA:  J Gen Psychol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  163-73     Citation Subset:  IM    
Affiliation:
Department of Psychology, University of North Dakota, PO Box 8380, Grand Forks, ND 58202-8380, USA. adam.derenne@und.nodak.edu
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MeSH Terms
Descriptor/Qualifier:
Discrimination Learning*
Generalization, Stimulus*
Humans
Photic Stimulation
Practice (Psychology)
Reaction Time

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