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Orbitofrontal function, object alternation and perseveration

M Freedman1, S Black, P Ebert

  • 1Department of Medicine, Mount Sinai Hospital and University of Toronto, Canada. morris.freedman@utoronto.ca

Cerebral Cortex (New York, N.Y. : 1991)
|March 24, 1998
PubMed
Summary
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Object alternation (OA) is validated as a measure of frontal lobe dysfunction in humans. Patients with frontal lesions showed significant impairments on OA, supporting its use in studying cognitive functions.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Object alternation (OA) is a key measure of perseveration and orbitofrontal function in primates.
  • Its validation as a measure of human frontal dysfunction is lacking.
  • Understanding frontal lobe function is crucial for diagnosing neurological and psychiatric conditions.

Purpose of the Study:

  • To validate object alternation (OA) as a measure of frontal lobe dysfunction in humans.
  • To identify specific neuroanatomical regions associated with OA deficits.
  • To support the use of animal-derived paradigms in human cognitive neuroscience.

Main Methods:

  • Six patients with bilateral frontal lobe lesions (CT/MRI confirmed) and 15 healthy controls participated.
  • Participants completed object alternation (OA), delayed alternation (DA), delayed response (DR), and Wisconsin Card Sorting Test (WCST).

Related Experiment Videos

  • Lesion analysis correlated performance with specific Brodmann areas.

    • Main Results:

    • Patients with frontal lesions were significantly impaired on OA, DA, DR, and WCST compared to controls.
    • Neuroanatomical analysis implicated Brodmann areas 10, 24, 32, 47, and possibly 11 in OA deficits.
    • OA demonstrated sensitivity to ventrolateral-orbitofrontal and medial frontal dysfunction.

    Conclusions:

    • Object alternation (OA) is a validated measure of frontal lobe dysfunction in humans.
    • OA is sensitive to specific ventrolateral-orbitofrontal and medial frontal impairments.
    • This study supports the translation of animal-based cognitive tasks for human neuroscience research.