A behavior systems view of the organization of multiple responses during a partially or continuously reinforced interfood clock |
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| Authors: | Email author" target="_blank">Kathleen?M?SilvaEmail author Email author" target="_blank">William?TimberlakeEmail author |
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| Institution: | Department of Psychology, University of Redlands, P.O. Box 3080, 1200 East Colton Avenue, Redlands, CA 92373-0999, USA. kathleen_silva@redlands.edu |
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| Abstract: | We examined how a 50% Pavlovian partial reinforcement (PRF) schedule, versus a 100% continuous reinforcement (CRF) schedule,
altered the asymptotic amount and distribution of focal and general search behavior in rats during 48-sec trials with and
without a four-segment interfood clock (S1-S2-S3-S4-US). Under CRF, but not PRF, average asymptotic focal search (nosing in
the feeder) increased across the last two clock segments (S3 and S4), and more for the clock group than the no-clock group.
Locomotor general search peaked in the second clock segment (S2) for the CRF-clock and CRF-no-clock groups and in S3 for the
PRF-clock groups. Furthermore, the ratio of general search to maximum focal search was higher for the PRF-clock group than
for the CRF-clock group. This pattern of results supports the view that predictable reward presentations temporally organize
search states and related responses between food presentations. The relative expression of these responses varies with the
predictability and proximity of reward and is more sharply defined in the presence of a clock. |
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