Document Detail

Reinforcement omission in concurrent fixed-interval and random-interval schedules.
MedLine Citation:
PMID:  17275211     Owner:  NLM     Status:  MEDLINE    
The present experiment examined overall and local effects of omission of reinforcers in a choice situation. Pigeons' key-pecking responses were reinforced under concurrent fixed-interval and random-interval schedules of food presentation. After some weeks of baseline sessions in which the probability of reinforcement was 1.00, approximately 25% of food presentations from the fixed-interval schedule were omitted and replaced by timeout periods. In such omission sessions, the overall relative rates of responding to the fixed-interval schedule became lower than those in the baseline sessions. On the other hand, when relative rates of responding to the fixed-interval schedule in the omission sessions were calculated separately for fixed-interval cycles preceded by timeout periods and those preceded by food presentations, the relative rates in the former type of fixed-interval cycles were higher than those in the latter type for three out of four pigeons. These results mean that relative rates of responding cannot always be regarded as reflecting a relative value of an alternative, and that the overall effect of the omission of fixed-interval reinforcers is not reducible to the local effect of omission.
Taku Ishii; Takayuki Sakagami
Publication Detail:
Type:  Journal Article     Date:  2006-12-20
Journal Detail:
Title:  Behavioural processes     Volume:  74     ISSN:  0376-6357     ISO Abbreviation:  Behav. Processes     Publication Date:  2007 Mar 
Date Detail:
Created Date:  2007-02-26     Completed Date:  2007-05-03     Revised Date:  2014-03-25    
Medline Journal Info:
Nlm Unique ID:  7703854     Medline TA:  Behav Processes     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  334-41     Citation Subset:  IM    
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MeSH Terms
Analysis of Variance
Choice Behavior / physiology*
Conditioning, Operant / physiology
Reinforcement Schedule*
Set (Psychology)*
Time Perception / physiology*

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