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Three Laboratory Procedures for Assessing Different Manifestations of Impulsivity in Rats
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Intertrial interval duration and impulsive choice.

John R Smethells1, Mark P Reilly

  • 1Central Michigan University.

Journal of the Experimental Analysis of Behavior
|December 24, 2014
PubMed
Summary
This summary is machine-generated.

Shortening the intertrial interval (ITI) in choice tasks increases impulsive choice in rats and pigeons. This suggests that trial spacing, not just reinforcer delay, significantly influences decision-making.

Keywords:
blackoutdelay discountingimpulsive choiceintertrial intervalpigeonrat

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Area of Science:

  • Behavioral economics
  • Animal behavior
  • Decision-making

Background:

  • Discrete-trial procedures assess impulsive choice, favoring immediate smaller rewards over larger delayed ones.
  • Research often focuses on reinforcer delay, overlooking the impact of intertrial intervals (ITIs).
  • Previous studies showed mixed results on ITI duration's effect on impulsive choice, possibly due to methodological limitations.

Purpose of the Study:

  • To investigate how manipulating intertrial interval (ITI) duration affects impulsive choice in rats and pigeons.
  • To determine if ITI duration is a critical factor in intertemporal choice behavior.
  • To address potential floor effects or inadequate ITI ranges in prior research.

Main Methods:

  • Conducted three experiments using discrete-trial intertemporal choice procedures with rats and pigeons.
  • Manipulated the duration of the intertrial interval (ITI) between choice trials.
  • Assessed preference for immediate smaller reinforcers versus larger, delayed reinforcers.

Main Results:

  • Shortening the ITI consistently decreased preference for the larger, delayed alternative, thus increasing impulsive choice.
  • This effect was observed in both rats and pigeons across all three experiments.
  • Impulsive choice was not influenced by ITI duration when the large alternative's delay was 0 seconds, ruling out satiation as a primary factor.

Conclusions:

  • Intertrial interval (ITI) duration is a significant temporal variable influencing impulsive choice.
  • Trial spacing, independent of reinforcer delay, plays a crucial role in decision-making processes.
  • Findings highlight the importance of considering all temporal parameters in intertemporal choice research.