Multiple-Interval Timing in Rats: Performance on Two-Valued Mixed Fixed-Interval Schedules

S. Whitaker, C. F. Lowe, J. H. Wearden

    Research output: Contribution to journalArticlepeer-review


    Three experiments studied timing in rats on 2-valued mixed-fixed-interval schedules, with equally probable components, Fixed-Interval S and Fixed-Interval L (FI S and FI L, respectively). When the L:S ratio was greater than 4, 2 distinct response peaks appeared close to FI S and FI L, and data could be well fitted by the sum of 2 Gaussian curves. When the L:S ratio was less than 4, only 1 response peak was usually visible, but nonlinear regression often identified separate sources of behavioral control, by FI S and FT L, although control by FI L dominated. Data were used to test ideas derived from scalar expectancy theory, the behavioral theory of timing, and learning to time.
    Original languageEnglish
    Pages (from-to)277-291
    Number of pages14
    JournalJournal of Experimental Psychology: Animal Behavior Processes
    Issue number4
    Publication statusPublished - Oct 2003


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