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Retroactive interference in discrimination learning

E G Heinemann, J Sage-Day, N Brenner

    Science (New York, N.Y.)
    |December 11, 1981
    PubMed
    Summary
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    Pigeons learned to distinguish stimuli, but this learned behavior was forgotten when rewards were given randomly without the original cues. This suggests that reinforcement schedules impact memory retention in avian subjects.

    Area of Science:

    • Animal behavior
    • Cognitive science
    • Avian learning

    Background:

    • Discrimination learning is a fundamental aspect of animal cognition.
    • Understanding how learned behaviors are maintained or extinguished is crucial for behavioral science.

    Purpose of the Study:

    • To investigate the impact of reinforcement schedules on previously learned discrimination in pigeons.
    • To determine if the absence of discriminative stimuli, coupled with random reinforcement, leads to forgetting.

    Main Methods:

    • Pigeons were trained in Stage 1 to discriminate between two auditory (noise) or visual (color) stimuli by pecking specific disks.
    • In Stage 2, discriminative stimuli were removed, and disk pecking was reinforced on a random schedule.

    Main Results:

    Related Experiment Videos

    • Pigeons successfully learned the discrimination tasks in Stage 1.
    • In Stage 2, the random reinforcement schedule without discriminative stimuli led to the pigeons forgetting the learned discrimination.

    Conclusions:

    • The removal of discriminative stimuli and the introduction of a random reinforcement schedule can effectively extinguish learned discriminations in pigeons.
    • This highlights the critical role of stimulus control in maintaining learned behaviors.