Rapid timing of a single transition in interfood interval duration by rats |
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| Authors: | Jennifer J Higa |
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| Institution: | 1. Department of Psychology: Experimental, Duke University, Box 90086, 27708-0086, Durham, NC
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| Abstract: | The present experiment examined temporal control of wait-time responses by interfood interval (IFI) duration. We exposed rats to a sequence of intervals that changed in duration at an unpredictable point within a session. In Phase 1, intervals changed from 15 to 5 sec (step-down) or from 15 to 45 sec (step-up). In Phase 2, we increased the intervals by a factor of four. We observed rapid timing effects during a transition in both phases of the experiment: A step-down and a step-up transition significantly decreased and increased wait time in thenext interval, respectively. Furthermore, adjustment of wait times during step-down was largely complete by the third transition IFI. In contrast, wait times gradually increased across several transition IFIs during step-up. The results reveal dynamic properties of temporal control that depend on the direction in which IFIs change. |
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