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The effect of cingulate cortex lesions on task switching and working memory.

M F S Rushworth1, K A Hadland, D Gaffan

  • 1University of Oxford, UK. matthew.rushworth@psy.ox.ac.uk

Journal of Cognitive Neuroscience
|May 6, 2003
PubMed
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Removing parts of the anterior cingulate cortex in macaques impaired task switching (TS) but not delayed alternation (DA). Findings suggest the anterior cingulate cortex is crucial for error monitoring and attention, distinct from prefrontal cortex functions.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Primate Studies

Background:

  • Anatomic links between prefrontal and anterior cingulate cortices suggest overlapping functions.
  • Neuroimaging implicates the cingulate cortex in task switching, error monitoring, and working memory.

Purpose of the Study:

  • To investigate the functional role of the anterior cingulate cortex in task switching, error monitoring, and working memory.
  • To differentiate the effects of anterior cingulate lesions from prefrontal lesions on cognitive tasks.

Main Methods:

  • Six macaques were trained on task switching (TS) and delayed alternation (DA) paradigms.
  • Experiments involved anterior cingulate lesions of varying sizes, including the cingulate sulcus.
  • Performance on TS and DA tasks was assessed, along with error patterns and reaction times.

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Main Results:

  • Larger anterior cingulate lesions consistently impaired TS performance.
  • DA performance showed only mild and equivocal impairment following lesions.
  • Error patterns in TS suggested a role in error monitoring and correction, but also potential attention deficits.

Conclusions:

  • Anterior cingulate cortex lesions specifically impair task switching, distinct from prefrontal cortex lesion effects.
  • The anterior cingulate cortex appears involved in monitoring responses for errors and maintaining task attention.
  • Lesion effects on delayed alternation were less pronounced, suggesting specialized roles within the cingulate cortex.