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Nucleus accumbens lesions decrease sensitivity to rapid changes in the delay to reinforcement.

Ashley Acheson1, Andrew M Farrar, Michele Patak

  • 1University of Chicago, Department of Psychiatry, Chicago, IL 60637, United States.

Behavioural Brain Research
|August 4, 2006
PubMed
Summary
This summary is machine-generated.

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Nucleus accumbens (NAC) lesions in rats reduced sensitivity to changes in delayed reward timing. This suggests the NAC is crucial for adapting to variable delays, not constant ones.

Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Decision Making

Background:

  • Individuals discount delayed rewards, with high discounting rates indicating impulsivity.
  • The nucleus accumbens (NAC) is implicated in reward processing and decision-making.

Purpose of the Study:

  • To investigate the neural mechanisms of delay discounting.
  • To examine the effect of nucleus accumbens (NAC) lesions on reward value discounting by delay and probability.

Main Methods:

  • Rats were trained on delay or probability discounting tasks.
  • Excitotoxic lesions of the NAC were induced using quinolinic acid.
  • Performance was assessed under constant and variable delay/probability conditions.

Main Results:

Related Experiment Videos

  • NAC lesions did not affect discounting of probabilistic rewards.
  • NAC lesions did not alter performance with constant delay or probability.
  • Lesioned rats showed flatter discount curves with variable delays, indicating reduced sensitivity to delay changes.

Conclusions:

  • Nucleus accumbens (NAC) lesions impair adaptation to frequently changing reward delays.
  • The NAC appears critical for predicting reward timing when delays vary.
  • NAC function is specific to adapting to delay variability, not constant delay or probability discounting.