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Encoding changes in orbitofrontal cortex in reversal-impaired aged rats.

Geoffrey Schoenbaum1, Barry Setlow, Michael P Saddoris

  • 1Department of Anatomy and Neurobiology, University of Maryland School of Medicine, 20 Penn St., HSF-2 Rm S251, Baltimore, MD 21201, USA. schoenbg@schoenbaumlab.org

Journal of Neurophysiology
|December 13, 2005
PubMed
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Normal aging impairs cognitive flexibility in rats, linked to orbitofrontal cortex dysfunction. Neural activity in aged rats with learning deficits showed reduced flexibility, impacting odor reversal learning.

Area of Science:

  • Neuroscience
  • Cognitive Aging
  • Behavioral Neuroscience

Background:

  • Normal aging is associated with cognitive decline, particularly in cognitive flexibility.
  • Prefrontal cortex circuits, especially the orbitofrontal cortex, are crucial for cognitive flexibility.
  • Aged rats exhibit deficits in rapid reversal learning, suggesting orbitofrontal cortex involvement.

Purpose of the Study:

  • To investigate whether aging-related reversal learning impairments are due to orbitofrontal cortex dysfunction.
  • To examine neural activity in the orbitofrontal cortex during reversal learning in young, unimpaired aged, and impaired aged rats.

Main Methods:

  • Identified aged rats with reversal learning deficits.
  • Recorded single-unit activity in the orbitofrontal cortex of young control rats, unimpaired aged rats, and impaired aged rats.

Related Experiment Videos

  • Assessed neural responses during odor discrimination learning and reversal tasks.

    • Main Results:

    • Orbitofrontal cortex neural activity showed diminished flexibility in aged rats with reversal deficits.
    • Cue-selective neurons in reversal-impaired aged rats failed to reverse odor preference during reversal learning.
    • Outcome-expectant neurons in impaired aged rats did not activate during cue sampling post-learning.

    Conclusions:

    • Aging-related cognitive inflexibility may stem from altered neural encoding in the orbitofrontal cortex.
    • Specific deficits in neuronal flexibility correlate with impaired reversal learning in aged rats.
    • Orbitofrontal cortex dysfunction provides a neural basis for age-associated cognitive inflexibility.