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Hemodynamic Signals Correlate Tightly with Synchronized Gamma Oscillations
Ist Teil von
Science (American Association for the Advancement of Science), 2005-08, Vol.309 (5736), p.948-951
Ort / Verlag
Washington, DC: American Association for the Advancement of Science
Erscheinungsjahr
2005
Link zum Volltext
Quelle
American Association for the Advancement of Science
Beschreibungen/Notizen
Functional imaging methods monitor neural activity by measuring hemodynamic signals. These are more closely related to local field potentials (LFPs) than to action potentials. We simultaneously recorded electrical and hemodynamic responses in the cat visual cortex. Increasing stimulus strength enhanced spiking activity, high-frequency LFP oscillations, and hemodynamic responses. With constant stimulus intensity, the hemodynamic response fluctuated; these fluctuations were only loosely related to action potential frequency but tightly correlated to the power of LFP oscillations in the gamma range. These oscillations increase with the synchrony of synaptic events, which suggests a close correlation between hemodynamic responses and neuronal synchronization.