Effects of free food deliveries and temporal contiguity on choice under concurrent-chain schedules.

Full Abstract

Eight pigeons responded in a concurrent chain with variable-interval (VI) 10-sec and VI 20-sec terminal links. Free food deliveries were then added to the initial links according to a variable-time (VT) 20-sec schedule in two conditions that differed in terms of whether a differential reinforcement of other (DRO) contingency was also arranged, which ensured that those deliveries could not occur within 2-sec of a response. Preference for the VI 10-sec terminal link increased when VT food was added, but not when the DRO contingency was operative, showing that free food deliveries affected preference only when those deliveries could be temporally contiguous with choice responding. This finding suggests that Mazur's (2003) report of increased preference with added VT food, replicated here, was due to adventitious reinforcement. Current models for behavioral choice are limited because they are based entirely on temporal relations between stimuli and reinforcers and fail to take into account response-reinforcer contiguity.

Author information

Author/s: Scoones, Carwyn (C); Hucks, Andrew (A); McLean, Anthony P (AP); Grace, Randolph C (RC);

Affiliation: University of Canterbury, Christchurch, New Zealand.

Journal and publication information

Publication Type: Journal Article

Journal: Psychonomic bulletin & review (Psychon Bull Rev), published in United States. (Language: eng)

Reference: 2009-Aug; vol 16 (issue 4) : pp 736-41

Dates: Created 2009/08/03; Completed 2009/10/13;

PMID: 19648461, status: MEDLINE (last retrieval date: 10/13/2009, IMS Date: )

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