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Related Experiment Videos

Schedule-induced polydipsia: are response-dependent schedules a limiting condition?

C D Burks

    Journal of the Experimental Analysis of Behavior
    |May 1, 1970
    PubMed
    Summary

    Collateral water intake in rats increased with longer intervals between food pellets, regardless of reinforcement schedule. This drinking behavior appears linked to interval duration, not accidental food reinforcement.

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    Area of Science:

    • Behavioral neuroscience
    • Animal behavior studies
    • Operant conditioning research

    Background:

    • Collateral behavior, such as drinking, can occur incidentally during operant conditioning.
    • Understanding factors influencing collateral behavior is crucial for interpreting animal learning studies.
    • Previous research has explored various factors affecting collateral responses.

    Purpose of the Study:

    • To investigate the relationship between inter-pellet interval duration and collateral water intake in rats.
    • To differentiate the roles of interval length versus adventitious reinforcement in driving collateral drinking.
    • To assess if collateral drinking is primarily controlled by temporal factors or accidental food delivery.

    Main Methods:

    • Equating inter-pellet intervals across fixed-ratio (FR) and fixed-time (FT) schedules for albino rats.

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  • Setting FT schedules based on individual mean FR session times divided by pellet count (150).
  • Systematically shifting between FR (20, 40, 80) and equated FT schedules to measure water intake.

    • Main Results:

    • Collateral water intake progressively increased with longer inter-pellet intervals for both FR and FT schedules.
    • Drinking behavior was consistently observed as a post-pellet event.
    • Findings suggest interval length, not adventitious food reinforcement, is the primary driver of this collateral drinking.

    Conclusions:

    • The duration of the inter-pellet interval is a significant determinant of collateral water intake in rats.
    • Collateral drinking under these conditions is more influenced by temporal factors than by accidental food reinforcement.
    • This study highlights the importance of temporal variables in shaping non-reinforced behaviors during operant conditioning.