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Related Experiment Videos

Yoked variable-ratio and variable-interval responding in pigeons.

A C Catania, T J Matthews, P J Silverman

    Journal of the Experimental Analysis of Behavior
    |September 1, 1977
    PubMed
    Summary
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    Pigeons pecked more frequently for food reinforcement under a variable-ratio schedule compared to a variable-interval schedule. This difference in key pecking rates emerged quickly, within four sessions, in yoked pairs.

    Area of Science:

    • Behavioral Psychology
    • Animal Cognition

    Background:

    • Operant conditioning principles govern animal behavior.
    • Reinforcement schedules significantly impact response rates.

    Purpose of the Study:

    • To compare the efficacy of variable-ratio (VR) versus variable-interval (VI) schedules in maintaining pigeon key pecking.
    • To investigate the rate of acquisition of differential response rates under yoked VR and VI schedules.

    Main Methods:

    • Pigeons were trained on key pecking tasks under operant conditioning.
    • Yoked control procedures were used to equate reinforcement opportunities between VR and VI schedules.
    • Response rates were recorded over multiple sessions.

    Main Results:

    • Variable-ratio schedules consistently produced higher key peck rates than variable-interval schedules.

    Related Experiment Videos

  • In over 75% of pigeon pairs, this rate difference was observed within two sessions.
  • The differential rates were established in all pairs within four sessions.

    • Conclusions:

    • Variable-ratio schedules are more effective in increasing response rates than variable-interval schedules in pigeons.
    • The behavioral effect of VR schedules over VI schedules is rapidly acquired.
    • These findings reinforce fundamental principles of operant conditioning.