Document Detail

Temporal landmarks: proximity prevails.
MedLine Citation:
PMID:  12720110     Owner:  NLM     Status:  MEDLINE    
Subjects in conditioning experiments time their conditioned responses relative to the onsets of the conditioned stimuli (CSs). These onsets are temporal landmarks, by reference to which subjects may estimate the location of the unconditioned stimulus (US) in time. In a serial compound conditioning paradigm, a long duration CS comes on first, followed later by a second shorter CS, creating both a long-range and a short-range predictor of the US. We ask whether displacing the short-range predictor relative to the long-range predictor causes subjects to strike a compromise between the different temporal locations predicted by the two CSs. In three experiments with pigeons, we varied the training conditions so as to favor or militate against this outcome. However, in all conditions, there was no compromise; after the onset of the displaced short-range CS, the timing of conditioned responding was governed by it alone. This result contrasts with the compromises that are seen when the feeding time predicted by a CS is put in conflict with the time predicted by the circadian clock, and with the similar compromises sometimes seen when a nearby spatial landmark is displaced relative to a larger spatial context.
S Fairhurst; C R Gallistel; J Gibbon
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.     Date:  2003-04-29
Journal Detail:
Title:  Animal cognition     Volume:  6     ISSN:  1435-9448     ISO Abbreviation:  Anim Cogn     Publication Date:  2003 Jun 
Date Detail:
Created Date:  2003-06-17     Completed Date:  2003-09-09     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  9814573     Medline TA:  Anim Cogn     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  113-20     Citation Subset:  IM    
New York State Psychiatric Institute, 1051 Riverside Dr., Unit 50, New York, NY 10032, USA.
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MeSH Terms
Conditioning, Operant
Reaction Time
Time Perception*
Grant Support

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