Medial prefrontal cortex lesions impair decision-making on a rodent gambling task: reversal by D1 receptor antagonist administration

Behav Brain Res. 2013 Apr 15;243:247-54. doi: 10.1016/j.bbr.2013.01.018. Epub 2013 Jan 24.

Abstract

Decision-making is a complex cognitive process that is impaired in a number of psychiatric disorders. In the laboratory, decision-making is frequently assessed using "gambling" tasks that are designed to simulate real-life decisions in terms of uncertainty, reward and punishment. Here, we investigate whether lesions of the medial prefrontal cortex (PFC) cause impairments in decision-making using a rodent gambling task (rGT). In this task, rats have to decide between 1 of 4 possible options: 2 options are considered "advantageous" and lead to greater net rewards (food pellets) than the other 2 "disadvantageous" options. Once rats attained stable levels of performance on the rGT they underwent sham or excitoxic lesions of the medial PFC and were allowed to recover for 1 week. Following recovery, rats were retrained for 5 days and then the effects of a dopamine D1-like receptor antagonist (SCH23390) or a D2-like receptor antagonist (haloperidol) on performance were assessed. Lesioned rats exhibited impaired decision-making: they made fewer advantageous choices and chose the most optimal choice less frequently than did sham-operated rats. Administration of SCH23390 (0.03 mg/kg), but not haloperidol (0.015-0.03 mg/kg) attenuated the lesion-induced decision-making deficit. These results indicate that the medial PFC is important for decision-making and that excessive signaling at D1 receptors may contribute to decision-making impairments.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Behavior, Animal / drug effects*
  • Behavior, Animal / physiology
  • Benzazepines / administration & dosage
  • Decision Making / drug effects*
  • Decision Making / physiology
  • Disease Models, Animal
  • Dopamine Antagonists / administration & dosage*
  • Dopamine D2 Receptor Antagonists
  • Gambling* / pathology
  • Gambling* / physiopathology
  • Gambling* / psychology
  • Haloperidol / administration & dosage
  • Male
  • Prefrontal Cortex* / drug effects
  • Prefrontal Cortex* / pathology
  • Prefrontal Cortex* / physiopathology
  • Rats
  • Rats, Sprague-Dawley
  • Receptors, Dopamine D1 / antagonists & inhibitors*

Substances

  • Benzazepines
  • Dopamine Antagonists
  • Dopamine D2 Receptor Antagonists
  • Receptors, Dopamine D1
  • SCH 23390
  • Haloperidol