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Science 22 June 1984:
Vol. 224. no. 4655, pp. 1355 - 1357
DOI: 10.1126/science.6729458
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Articles

Science, Vol 224, Issue 4655, 1355-1357
Copyright © 1984 by American Association for the Advancement of Science

articles

Is there an evoked vascular response?

CA Sandman, JP O'Halloran, and R Isenhart

Event-related potentials of the brain are enhanced when stimulation is synchronized with diastolic phases of cerebral or cephalic pulse pressure waves. A cerebral vascular event has been found to be temporally consistent with the event-related potential. Averaged evoked vascular responses were measured with bioimpedance techniques from the brain and the arm. Changes in brain blood volume occurred 150 to 250 milliseconds after stimulation synchronized with diastolic but not systolic phases of the cerebral pulse pressure wave. The time course of this phenomenon defies the usually accepted characteristics of metabolic activity. The evoked vascular response may be a neurally mediated event in anticipation of altered metabolic demand, and it offers the possibility of measurement in real time.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Functional mapping of the human visual cortex by magnetic resonance imaging.
J. Belliveau, D. Kennedy Jr, R. McKinstry, B. Buchbinder, R. Weisskoff, M. Cohen, J. Vevea, T. Brady, and B. Rosen (1991)
Science 254, 716-719
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