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Intertrial unconditioned stimuli differentially impact trace conditioning
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Williams, Douglas A., Todd, Travis P., Chubala, Chrissy M. and Ludvig, Elliot Andrew (2017) Intertrial unconditioned stimuli differentially impact trace conditioning. Learning & Behavior, 45 (1). pp. 49-61. doi:10.3758/s13420-016-0240-3
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Official URL: http://dx.doi.org/10.3758/s13420-016-0240-3
Abstract
Three experiments assessed how appetitive conditioning in rats changes over the duration of a trace conditioned stimulus (CS) when unsignaled unconditioned stimuli (USs) are introduced into the intertrial interval. In Experiment 1, a target US occurred at a fixed time either shortly before (embedded), shortly after (trace), or at the same time (delay) as the offset of a 120-s CS. During the CS, responding was most suppressed by intertrial USs in the trace group, less so in the delay group, and least in the embedded group. Unreinforced probe trials revealed a bell-shaped curve centered on the normal US arrival time during the trace interval, suggesting that temporally-specific learning occurred both with and without intertrial USs. Experiments 2a and 2b confirmed that the bulk of the trace CS became inhibitory when intertrial USs were scheduled, as measured by summation and retardation tests, even though CS offset evoked a temporally precise conditioned response. Thus, an inhibitory CS may give rise to new stimuli specifically linked to its termination, which were excitatory. A modification to the micostimulus temporal difference model is offered to account for the data.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | B Philosophy. Psychology. Religion > BF Psychology | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Psychology | ||||||||
| Library of Congress Subject Headings (LCSH): | Conditioned response -- Rats -- Experiments | ||||||||
| Journal or Publication Title: | Learning & Behavior | ||||||||
| Publisher: | Springer New York LLC | ||||||||
| ISSN: | 1543-4494 | ||||||||
| Official Date: | March 2017 | ||||||||
| Dates: |
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| Volume: | 45 | ||||||||
| Number: | 1 | ||||||||
| Number of Pages: | 13 | ||||||||
| Page Range: | pp. 49-61 | ||||||||
| DOI: | 10.3758/s13420-016-0240-3 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Funder: | Natural Sciences and Engineering Research Council of Canada (NSERC) |
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