Top-Down Versus Bottom-Up Control of Attention in the Prefrontal and Posterior Parietal Cortices

American Association for the Advancement of Science (AAAS) - Tập 315 Số 5820 - Trang 1860-1862 - 2007
Timothy J. Buschman1, Earl K. Miller1
1Picower Institute for Learning and Memory, RIKEN-MIT Neuroscience Research Center, and Department of Brain and Cognitive Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Tóm tắt

Attention can be focused volitionally by “top-down” signals derived from task demands and automatically by “bottom-up” signals from salient stimuli. The frontal and parietal cortices are involved, but their neural activity has not been directly compared. Therefore, we recorded from them simultaneously in monkeys. Prefrontal neurons reflected the target location first during top-down attention, whereas parietal neurons signaled it earlier during bottom-up attention. Synchrony between frontal and parietal areas was stronger in lower frequencies during top-down attention and in higher frequencies during bottom-up attention. This result indicates that top-down and bottom-up signals arise from the frontal and sensory cortex, respectively, and different modes of attention may emphasize synchrony at different frequencies.

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Supported by NSF grant SBE0354378 and National Institute of Neurological Disorders and Stroke grant R01NS035145. We thank S. Henrickson J. Roy and M. Wicherski for comments on the manuscript; W. Asaad and K. Maccully for technical and other support; and E. N. Brown for help with the statistical analyses.

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American Association for the Advancement of Science (AAAS)

Tập 315 Số 5820

1860-1862

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