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Darren R Christensen1, Randolph C Grace

  • 1University of Canterbury, Department of Psychology, Private Bag 4800, Christchurch, New Zealand. drc41@student.canterbury.ac.nz

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Pigeons showed a bitonic preference in concurrent chains tasks, challenging existing models. An extended decision model successfully predicted this non-monotonic choice behavior.

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Area of Science:

  • Behavioral Psychology
  • Animal Cognition
  • Operant Conditioning

Background:

  • Concurrent chains procedures are used to study choice behavior in animals.
  • Existing models like delay-reduction theory (DRT) predict monotonic choice functions.
  • Previous research has focused on steady-state choice, but dynamic conditions require further investigation.

Purpose of the Study:

  • To investigate pigeon choice behavior in a concurrent chains procedure with varying terminal-link schedules.
  • To determine if initial-link response allocation follows a monotonic or non-monotonic function.
  • To test the predictive power of existing and extended decision models for choice behavior.

Main Methods:

  • Pigeons were trained using a concurrent chains procedure with fixed-interval (FI) terminal links and a variable-interval (VI) initial link.
  • Terminal-link schedules were alternated (FI 10s FI 20s or FI 20s FI 10s).
  • Initial-link schedule duration was systematically varied across sessions to observe its effect on response allocation.

Main Results:

  • Initial-link response allocation stabilized and became sensitive to terminal-link immediacy.
  • Response allocation exhibited a bitonic function across the range of initial-link durations.
  • Preference for the shorter FI schedule initially increased and then decreased as initial-link duration increased.

Conclusions:

  • The observed bitonic function challenges traditional steady-state choice models like DRT.
  • An extended decision model successfully predicted the bitonic choice pattern.
  • This extended model may offer a unified explanation for choice behavior under both steady-state and dynamic conditions.