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Fixed-ratio performance with and without a postreinforcement timeout.

J E Mazur, M E Hyslop

    Journal of the Experimental Analysis of Behavior
    |September 1, 1982
    PubMed
    Summary
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    Pigeons showed shorter pauses before fixed-ratio (FR) trials following timeouts, indicating behavioral contrast. Response patterns systematically changed within FR schedules, influenced by both ratio size and progress.

    Area of Science:

    • Behavioral psychology
    • Animal behavior studies
    • Operant conditioning research

    Background:

    • Fixed-ratio (FR) schedules are fundamental in operant conditioning.
    • Understanding response patterns within FR schedules is crucial for behavioral analysis.
    • Transient behavioral contrast can influence response initiation.

    Purpose of the Study:

    • To investigate the impact of preceding timeouts on fixed-ratio (FR) performance in pigeons.
    • To analyze the temporal patterns of interresponse times (IRTs) during FR schedules.
    • To determine how response characteristics change as a function of progress through an FR requirement.

    Main Methods:

    • Pigeons were trained on FR schedules (50, 100, 150 responses) with interspersed 30-second timeouts.

    Related Experiment Videos

  • Preratio pauses and interresponse times (IRTs) were systematically analyzed.
  • Behavioral contrast was assessed by comparing responses on trials with and without preceding timeouts.

    • Main Results:

    • Preratio pauses were significantly shorter on FR trials preceded by timeouts.
    • IRT analysis revealed three distinct categories: short (.1s), intermediate (.3s), and long (> .5s).
    • The probability of short IRTs increased monotonically across a trial, while intermediate and long IRTs showed more complex patterns related to ratio completion.

    Conclusions:

    • Preceding timeouts induce shorter preratio pauses, likely due to transient behavioral contrast.
    • Response patterns within an FR schedule evolve systematically, with distinct IRT categories changing in probability.
    • Behavioral performance on FR schedules is influenced by both the absolute ratio size and the relative position within the ratio.