Brain areas specific for attentional load in a motion-tracking task

Jorge Jovicich, Robert J. Peters, Christof Koch, Jochen Braun, Linda Chang, Thomas Ernst

Research output: Contribution to journalArticlepeer-review


Although visual attention is known to modulate brain activity in the posterior parietal, prefrontal, and visual sensory areas, the unique roles of these areas in the control of attentional resources have remained unclear. Here, we report a dissociation in the response profiles of these areas. In a parametric functional magnetic resonance imaging (fMRI) study, subjects performed a covert motion-tracking task, in which we manipulated "attentional load" by varying the number of tracked balls. While strong effects of attention - independent of attentional load - were widespread, robust linear increases of brain activity with number of balls tracked were seen primarily in the posterior parietal areas, including the intraparietal sulcus (IPS) and superior parietal lobule (SPL). Thus, variations in attentional load revealed different response profiles in sensory areas as compared to control areas. Our results suggest a general role for posterior parietal areas in the deployment of visual attentional resources.

Original languageEnglish
Pages (from-to)1048-1058
Number of pages11
JournalJournal of Cognitive Neuroscience
Issue number8
Publication statusPublished - Nov 15 2001

ASJC Scopus subject areas

  • Behavioral Neuroscience
  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience


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