Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 110, Issue 48, Pages 19585-19590Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1307947110
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Funding
- James S. McDonnell Foundation
- Doris Duke Foundation
- National Institute of Mental Health [R01 MH 71920-09]
- National Institute of Health [5T32EY013360-10, UL1 TR000448, TL1 TR000449]
- National Science Foundation [NSF EFRI-1137211]
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Selective attention allows us to filter out irrelevant information in the environment and focus neural resources on information relevant to our current goals. Functional brain-imaging studies have identified networks of broadly distributed brain regions that are recruited during different attention processes; however, the dynamics by which these networks enable selection are not well understood. Here, we first used functional MRI to localize dorsal and ventral attention networks in human epileptic subjects undergoing seizure monitoring. We subsequently recorded cortical physiology using subdural electrocorticography during a spatial-attention task to study network dynamics. Attention networks become selectively phase-modulated at low frequencies (delta, theta) during the same task epochs in which they are recruited in functional MRI. This mechanism may alter the excitability of task-relevant regions or their effective connectivity. Furthermore, different attention processes (holding vs. shifting attention) are associated with synchrony at different frequencies, which may minimize unnecessary cross-talk between separate neuronal processes.
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