Journal
JOURNAL OF COGNITIVE NEUROSCIENCE
Volume 13, Issue 8, Pages 1048-1058Publisher
MIT PRESS
DOI: 10.1162/089892901753294347
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Funding
- NIDA NIH HHS [5K20 DA 00280] Funding Source: Medline
- NIMH NIH HHS [1R01 MH 61427-01] Funding Source: Medline
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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 are-is, 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.
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