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Choice, time allocation, and response rate during stimulus generalization.

C Mandell, J A Nevin

    Journal of the Experimental Analysis of Behavior
    |July 1, 1977
    PubMed
    Summary
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    Pigeons learned to differentiate noise levels by choosing keys, allocating time, and responding. Reinforcement density influenced their choices and response rates, indicating separate control mechanisms for behavior.

    Area of Science:

    • Behavioral neuroscience
    • Animal cognition
    • Psychophysics

    Background:

    • Discrimination tasks are crucial for understanding sensory perception and decision-making in animals.
    • Simultaneous assessment of choice, time allocation, and response rate provides a comprehensive view of behavior.

    Purpose of the Study:

    • To investigate how pigeons discriminate between different noise intensities.
    • To examine the independent and simultaneous effects of choice, time allocation, and response rate on behavior.
    • To analyze the influence of relative reinforcement density on these behavioral measures.

    Main Methods:

    • Six pigeons were trained on a two-key discrimination task with varying noise intensities (S1, S2).
    • Choice, time allocation, and response rate were measured independently and simultaneously.

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  • Reinforcement density was manipulated across conditions, followed by generalization tests.

    • Main Results:

    • Sigmoidal gradients were observed for choice, time allocation, and response components as a function of stimulus intensity.
    • These gradients showed slight shifts with changes in relative reinforcement density.
    • Changeovers peaked when initial choice proportions were near 0.5.
    • Absolute response counts were sensitive to reinforcement density, while momentary response rates also varied.

    Conclusions:

    • Behavioral measures like choice and time allocation are influenced by stimulus intensity and reinforcement density.
    • Separate control of choice and response rate by reinforcement contingencies was suggested by training observations.
    • Pigeons exhibit complex discrimination abilities, with distinct behavioral components modulated by external stimuli and reinforcement schedules.