Abstract
Blood flow velocities of the posterior cerebral arteries were obtained while healthy subjects were engaged in a visual spatial attention task. Experimental runs consisted of series of stimuli comprised of four elements (two left and two right of a central fixation point) presented briefly in blue against a purple screen. After a period of passive viewing a left or right pointing arrow indicated the visual half-field to be attended by the subjects in order to detect identical symbols on the attended side. Relative to the passive viewing condition a marked increase of flow was seen in both posterior cerebral arteries during the attention period. No differential increase of flow as a function of attended field was detected. These results are discussed in comparison with recent positron-emission tomography (PET) and electrophysiological data obtained with the same task.
Original language | English |
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Journal | Neuroscience Letters |
Volume | 214 |
Issue number | 1 |
Pages (from-to) | 41-44 |
Number of pages | 4 |
ISSN | 0304-3940 |
DOIs | |
Publication status | Published - 16.08.1996 |
Research Areas and Centers
- Academic Focus: Center for Brain, Behavior and Metabolism (CBBM)