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Auditory generalization gradients for response latency in the monkey.

D B Moody, W C Stebbins, C Iglauer

    Journal of the Experimental Analysis of Behavior
    |July 1, 1971
    PubMed
    Summary
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    Monkeys learned to discriminate between pure-tone frequencies. Discrimination training showed increased response latency to negative stimuli, without behavioral contrast effects on positive stimuli.

    Area of Science:

    • Behavioral neuroscience
    • Animal behavior

    Background:

    • Auditory perception and discrimination are crucial for many species.
    • Understanding the mechanisms of stimulus control in operant conditioning provides insight into sensory processing.

    Purpose of the Study:

    • To investigate auditory frequency discrimination in non-human primates.
    • To examine the effects of differential reinforcement and extinction on response latencies.
    • To determine generalization gradients following discrimination training.

    Main Methods:

    • Monkeys were trained to perform a key-press task, releasing the key in response to pure tones.
    • Differential reinforcement was applied to one frequency (positive stimulus) and extinction to another (negative stimulus).
    • Generalization gradients were assessed by varying the frequency of the negative stimulus.

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    Main Results:

    • Response latencies to the negative stimulus gradually increased, along with response variability.
    • No evidence of behavioral contrast was observed, indicated by a lack of concurrent decrease in latencies to the positive stimulus.
    • Resulting generalization gradients showed similar latencies across negative stimulus frequencies and shorter latencies to the positive stimulus frequency.

    Conclusions:

    • Monkeys can discriminate between auditory frequencies based on differential reinforcement and extinction procedures.
    • The study highlights the impact of stimulus properties on response timing and variability.
    • Generalization gradients provide a measure of the stimulus control exerted by the trained frequencies.