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Related Concept Videos

Timing and Consequences on Behavior01:08

Timing and Consequences on Behavior

In operant conditioning, the timing of reinforcement is crucial. For animals like rats and cats, immediate reinforcement (within a few seconds) is much more effective than delayed reinforcement. For example, a food reward for a rat needs to follow within 30 seconds of pressing a bar to be effective. 
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Related Experiment Video

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Measuring Delay Discounting in Humans Using an Adjusting Amount Task
07:47

Measuring Delay Discounting in Humans Using an Adjusting Amount Task

Published on: January 9, 2016

Delay discounting and gambling.

Gregory J Madden1, Monica T Francisco, Adam T Brewer

  • 1University of Kansas, Kansas, United States. greg.madden@usu.edu

Behavioural Processes
|March 1, 2011
PubMed
Summary
This summary is machine-generated.

This study investigated delay discounting and gambling behavior in rats. Results showed that impulsive choice was not correlated with preference for immediate rewards, challenging a key hypothesis about gambling.

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Area of Science:

  • Behavioral neuroscience
  • Decision-making research

Background:

  • Delay discounting, the devaluation of rewards with increasing delay, is linked to problem gambling.
  • A hypothesis suggests steeper discounting amplifies the value difference between fixed and variable delayed rewards, favoring variable rewards.

Purpose of the Study:

  • To test the prediction that steeper delay discounting increases preference for variable-delay rewards over fixed-delay rewards.
  • To examine the relationship between impulsive choice and preference for mixed- versus fixed-delay rewards in rats.

Main Methods:

  • Rats' impulsive choices were assessed across four delays to a larger-later reinforcer.
  • Preference for mixed-delay over fixed-delay rewards was quantified by adjusting fixed-delay duration to achieve indifference.

Main Results:

  • Impulsive choice percentage did not correlate with the fixed delay at indifference, failing to support the hyperbolic model's prediction regarding gambling.
  • A subsequent assessment revealed a significant decrease in impulsive choice after the preference assessment phase.

Conclusions:

  • The study did not find support for the hypothesis linking steep delay discounting to a stronger preference for variable-delay rewards, challenging a model of gambling behavior.
  • A decrease in impulsive choice post-experiment suggests potential shifts in decision-making strategies that may influence observed correlations.