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  • 1Department of Psychology, University of Western Ontario, London, Ontario, Canada.

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Pigeons exhibit postreinforcement pauses (PRPs) proportional to the interfood interval (IFI). This study supports the linear waiting hypothesis, suggesting it explains PRPs across various fixed-interval schedules, including complex chained schedules.

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Area of Science:

  • Behavioral psychology
  • Animal behavior studies
  • Operant conditioning research

Background:

  • Pigeons demonstrate consistent postreinforcement pauses (PRPs) after receiving food at regular intervals.
  • These pauses are a predictable proportion of the interfood interval (IFI).
  • The linear waiting hypothesis was proposed to explain these pauses on specific schedules.

Purpose of the Study:

  • To investigate pigeon behavior on chained schedules of reinforcement with varying interfood intervals (IFIs).
  • To test the applicability of the linear waiting hypothesis to PRPs under different fixed-interval schedule conditions.
  • To replicate and extend previous findings on PRPs in pigeons.

Main Methods:

  • Pigeons were trained on two distinct chained schedules of reinforcement.
  • One schedule featured cyclically changing interfood intervals (IFIs).
  • The other schedule maintained a constant interfood interval (IFI).

Main Results:

  • Pigeon performance on both chained schedules provided evidence supporting the linear waiting hypothesis.
  • The study observed that postreinforcement pauses (PRPs) remained proportional to the interfood interval (IFI).
  • Results aligned with prior research on similar schedules by Innis et al. (1993).

Conclusions:

  • The linear waiting hypothesis effectively accounts for postreinforcement pauses (PRPs) in pigeons.
  • This principle applies to PRPs across various fixed-interval schedules, including complex chained schedules.
  • The findings reinforce the robustness of the linear waiting model in explaining temporal behaviors in pigeons.