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Related Experiment Videos

Schedule-induced aggression as a function of fixed-ratio value.

D R Cherek, R Pickens

    Journal of the Experimental Analysis of Behavior
    |November 1, 1970
    PubMed
    Summary
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    Increasing food rewards for pigeons led to increased aggression towards other birds. Attacks peaked days after the reward change and then subsided, showing a delayed but temporary rise in aggressive behavior.

    Area of Science:

    • Behavioral science
    • Animal behavior studies

    Background:

    • Reinforcement schedules are crucial in understanding animal behavior.
    • Fixed-ratio schedules involve reinforcement after a set number of responses.

    Purpose of the Study:

    • To investigate the impact of altered fixed-ratio reinforcement schedules on pigeon aggression.
    • To determine if changes in reward value influence aggressive responses in pigeons.

    Main Methods:

    • Pigeons were trained to respond for food under fixed-ratio schedules.
    • The ratio value was systematically increased and decreased.
    • Aggressive attacks on live target birds were recorded and analyzed.

    Main Results:

    • Pigeons attacked target birds significantly when the fixed-ratio value increased.

    Related Experiment Videos

  • No significant increase in attacks was observed when the ratio value decreased.
  • The frequency of attacks peaked several days post-ratio change, then returned to baseline levels.

    • Conclusions:

    • Altering reinforcement schedules can induce aggressive behavior in pigeons.
    • The effects of reinforcement changes on aggression are not immediate but show a delayed peak.
    • Pigeon aggression levels under fixed-ratio schedules are sensitive to increases in reward value.