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Evidence for multiple manipulation processes in prefrontal cortex.

Dana A Eldreth1, Michael D Patterson, Anthony J Porcelli

  • 1Department of Psychology, Rutgers University, Smith Hall, 101 Warren Street, Newark, NJ 07102, USA.

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Summary
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Brain imaging reveals distinct neural processes for maintaining item order versus reordering information in working memory (WM). These findings differentiate the cognitive functions within the prefrontal cortex (PFC).

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • The prefrontal cortex (PFC) is crucial for working memory (WM) processes.
  • Previous brain imaging studies linked memory-load-dependent activation increases in the dorsal PFC to WM tasks, particularly delayed response tasks (DRTs).
  • These increases were hypothesized to reflect information manipulation for memory consolidation, based on similar patterns in tasks requiring overt reordering.

Purpose of the Study:

  • To investigate the functional equivalence between maintaining item order and reordering information within WM.
  • To determine if distinct neural mechanisms underlie these different WM manipulation tasks.

Main Methods:

  • Participants performed a DRT with memory loads of 3 to 6 letters.
  • Two conditions were used: 'item-order' (remembering presentation sequence) and 'reordering' (remembering in alphabetical order).
  • Functional magnetic resonance imaging (fMRI) was employed to measure brain activity.

Main Results:

  • Load-related activation increases were observed in the dorsal PFC during encoding and maintenance in the item-order condition.
  • Conversely, load-related activation decreases were found in the same periods during the reordering condition.
  • This dissociation suggests different neural substrates for the two WM tasks.

Conclusions:

  • The neural substrates for retaining list order and reordering information are not equivalent.
  • Cognitive processes for long-list retention are better represented by item-order maintenance than by reordering.
  • fMRI data indicate that multiple forms of WM manipulation are dissociable.