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Stimulus effects on concurrent performance in transition.

E S Hanna, D E Blackman, J C Todorov

    Journal of the Experimental Analysis of Behavior
    |September 1, 1992
    PubMed
    Summary
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    Differential discriminative stimuli accelerate the development of differential responding in pigeons under concurrent schedules. However, these effects diminish as training progresses, highlighting the importance of studying behavioral transitions.

    Area of Science:

    • Behavioral psychology
    • Animal behavior studies
    • Operant conditioning

    Background:

    • Pigeons are frequently used models for studying choice behavior.
    • Concurrent variable-interval variable-interval schedules are standard for investigating choice and reinforcement distribution.
    • The role of discriminative stimuli in shaping rapid behavioral transitions is not fully understood.

    Purpose of the Study:

    • To investigate the impact of differential discriminative stimuli on the acquisition of differential responding in pigeons.
    • To compare the effects of differential versus nondifferential stimuli on behavioral sensitivity to reinforcement distribution.
    • To examine the duration of stimulus control over behavior under concurrent schedules.

    Main Methods:

    • Six experimentally naive pigeons were trained using a three-key concurrent variable-interval variable-interval procedure.

    Related Experiment Videos

  • Food reinforcement was delivered for side-key pecks; center-key pecks served as changeover responses.
  • Differential discriminative stimuli (colored keys) were contrasted with nondifferential stimuli across two phases, with conditions reversed between phases.

    • Main Results:

    • Differential discriminative stimuli significantly reduced the time to establish differential responding.
    • These stimuli enhanced behavioral sensitivity to reinforcement distribution within the initial hour of training.
    • The influence of differential stimuli became indistinguishable from reinforcement distribution effects in later training hours.

    Conclusions:

    • Differential discriminative stimuli accelerate the development of complex choice behavior in pigeons.
    • Studying behavioral transitions is crucial for a comprehensive understanding of learning.
    • Findings may reconcile discrepancies between human and nonhuman subject studies in similar paradigms.