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Science 19 November 1999: Vol. 286. no. 5444, pp. 1555 - 1558 DOI: 10.1126/science.286.5444.1555
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Reports
Increased Cortical Oxidative Metabolism Due to Sensory Stimulation: Implications for Functional Brain Imaging
Ivo Vanzetta,
Amiram Grinvald
Modern functional brain mapping relies on interactions of neuronal
electrical activity with the cortical microcirculation. The existence
of a highly localized, stimulus-evoked initial deoxygenation has
remained a controversy. Here, the activity-dependent oxygen tension
changes in the microcirculation were measured directly, using
oxygen-dependent phosphorescence quenching of an exogenous indicator.
The first event after sensory stimulation was an increase in oxygen
consumption, followed by an increase in blood flow. Because oxygen
consumption and neuronal activity are colocalized but the delayed blood
flow is not, functional magnetic resonance imaging focused on this
initial phase will yield much higher spatial resolution, ultimately
enabling the noninvasive visualization of fundamental processing
modules in the human brain.
Department of Neurobiology, Center for Research of Higher Brain
Functions, Weizmann Institute of Science, Rehovot 76100, Israel.
Read the Full Text
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