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Related Experiment Videos

Avoidance responding as a function of stimulus duration and relation to free shock.

E Shimoff

    Journal of the Experimental Analysis of Behavior
    |May 1, 1972
    PubMed
    Summary

    Fear conditioning in rhesus monkeys shows that the timing between a warning tone and an electric shock significantly impacts avoidance responses. Shorter delays between tone and shock intensify fear responses, while longer delays reduce them.

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    Area of Science:

    • Behavioral Neuroscience
    • Animal Behavior
    • Learning and Memory

    Background:

    • Fear conditioning is a fundamental learning process involving the association of neutral stimuli with aversive events.
    • The temporal relationship between conditioned and unconditioned stimuli is critical in shaping fear responses.
    • Existing paradigms like conditioned emotional response, trace conditioning, and safety-signal training represent different temporal gaps.

    Purpose of the Study:

    • To investigate the effect of varying temporal gaps between a warning tone and an electric shock on avoidance responding in rhesus monkeys.
    • To examine how different tone durations interact with temporal gaps in modulating fear responses.
    • To explore the continuum of fear conditioning procedures based on inter-stimulus intervals.

    Main Methods:

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    • Four groups of rhesus monkeys were exposed to response-independent pairings of a tone and shock.
    • Temporal gaps of 0, 5, 20, and 80 seconds were introduced between tone termination and shock delivery.
    • Tone durations of 10, 20, 40, and 80 seconds were tested within each group.

    Main Results:

    • A distinct response pattern of initial acceleration followed by deceleration was observed only when the shock immediately followed the tone (0-sec gap).
    • Response rates during the initial 5 seconds of the tone were influenced by both tone duration and the gap duration.
    • For shorter gaps (0-5 sec), longer tones led to higher initial response rates; this effect diminished with longer gaps.

    Conclusions:

    • The temporal proximity of aversive events is a key determinant of conditioned fear response patterns.
    • The study bridges distinct fear conditioning paradigms by examining a continuous range of inter-stimulus intervals.
    • Findings highlight the nuanced interplay between stimulus duration and temporal spacing in associative learning.