Prefrontal cortex fMRI signal changes are correlated with working memory load

Dara S. Manoach, Gottfried Schlaug, Bettina Siewert, David G. Darby, Benjamin Martin Bly, Andrew Benfield, Robert R. Edelman, Steven Warach

Research output: Contribution to journalArticlepeer-review

222 Scopus citations


We investigated whether a nonspatial working memory (WM) task would activate dorsolateral prefrontal cortex (DLPFC) and whether activation would be correlated with WM load. Using functional magnetic resonance imaging we measured regional brain signal changes in 12 normal subjects performing a continuous performance, choice reaction time task that requires WM. A high WM load condition was compared with a non-WM choice reaction time control condition (WM effect) and a low WM load condition (load effect). Significant changes in signal intensity occurred in the DLPFC, frontal motor regions and the intraparietal sulcus (IPS) in both comparisons. These findings support the role of DLPFC and IPS in WM and suggest that signal changes in DLPFC correlate with WM load.

Original languageEnglish (US)
Pages (from-to)545-549
Number of pages5
Issue number2
StatePublished - Jan 1 1997


  • Functional MRI
  • Intraparietal sulcus
  • Prefrontal cortex
  • Working memory

ASJC Scopus subject areas

  • Neuroscience(all)


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