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Related Experiment Videos

Prelimbic cortex specific lesions disrupt delayed-variable response tasks in the rat

B Delatour1, P Gisquet-Verrier

  • 1Laboratoire de Neurobiologie de I'Apprentissage et de la Mémoire, Université Paris-Sud, Orsay, France.

Behavioral Neuroscience
|December 1, 1996
PubMed
Summary

Prelimbic cortex (PL) lesions in rats impaired spatial alternation and delayed-variable response tasks. These findings suggest the PL cortex is crucial for working memory and response selection.

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Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Cognitive Neuroscience

Background:

  • The prefrontal cortex plays a vital role in complex cognitive functions.
  • The prelimbic cortex (PL), a subregion of the medial prefrontal cortex, is implicated in various behaviors, but its specific functions require further elucidation.

Purpose of the Study:

  • To investigate the specific role of the prelimbic cortex (PL) in cognitive tasks using excitotoxic lesions in rats.
  • To determine the contribution of the PL to working memory, response selection, and attention.

Main Methods:

  • Excitotoxic lesions were employed to selectively target the prelimbic cortex (PL) in adult male rats.
  • Rats underwent a battery of behavioral tasks, including spontaneous and reinforced spatial delayed-alternation tasks, a temporal go/no-go alternation schedule, a runway task, and radial-arm maze tasks with fixed and variable goal locations.

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Main Results:

  • PL lesions significantly altered alternation scores in spatial delayed-alternation tasks.
  • Lesions delayed conditioning in a temporal go/no-go alternation schedule but did not affect continuous reinforcement tasks.
  • Acquisition of standard radial-arm maze tasks and fixed-goal location tasks remained unaffected, while variable-goal location tasks were disrupted.
  • PL lesions mimicked deficits observed with larger prefrontal lesions, impairing delayed-variable response tasks while sparing fixed-response tasks.

Conclusions:

  • The prelimbic cortex (PL) is critical for specific aspects of spatial working memory and response selection.
  • PL function appears essential for tasks requiring flexible goal-directed behavior and adaptation to changing environmental contingencies.
  • These findings support the involvement of the PL in higher-order cognitive processes, including working memory, response selection, and attentional mechanisms.