Functional decoupling of BOLD and gamma-band amplitudes in human primary visual cortex.

Human Brain Mapping
Suresh D Muthukumaraswamy, Krish D Singh

Abstract

Although functional magnetic resonance imaging is an important tool for measuring brain activity, the hemodynamic blood oxygenation level dependent (BOLD) response is only an indirect measure of neuronal activity. Converging evidence obtained from simultaneous recording of hemodynamic and electrical measures suggest that the best correlate of the BOLD response in primary visual cortex is gamma-band oscillations ( approximately 40 Hz). Here, we examined the coupling between BOLD and gamma-band amplitudes measured with magntoencephalography (MEG) in human primary visual cortex in 10 participants. In Experiment A, participants were exposed to grating stimuli at two contrast levels and two spatial frequencies and in Experiment B square and sine wave stimuli at two spatial frequencies. The amplitudes of both gamma-band oscillations and BOLD showed tuning with stimulus contrast and stimulus type; however, gamma-band oscillations showed a 300% increase across two spatial frequencies, whereas BOLD exhibited no change. This functional decoupling demonstrates that increased amplitude of gamma-band oscillations as measured with MEG is not sufficient to drive the subsequent BOLD response.

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Citations

May 7, 2009·Proceedings of the National Academy of Sciences of the United States of America·Suresh D MuthukumaraswamyKrish D Singh
Nov 26, 2010·Journal of Neurology, Neurosurgery, and Psychiatry·Thomas BlauwblommeOlivier David
Oct 12, 2010·Consciousness and Cognition·Georg NorthoffTodd E Feinberg
Nov 19, 2013·NeuroImage·Emma L HallMatthew J Brookes
Jul 1, 2015·European Neuropsychopharmacology : the Journal of the European College of Neuropsychopharmacology·Alexander D ShawSuresh D Muthukumaraswamy
Jul 31, 2013·NeuroImage·Dora HermesNick F Ramsey
Jun 2, 2016·Proceedings of the National Academy of Sciences of the United States of America·René ScheeringaDavid G Norris
Oct 14, 2017·Cerebral Cortex·Giulia LiberatiAndré Mouraux
Jul 9, 2010·The Journal of Head Trauma Rehabilitation·Kelly J Jantzen
Jul 9, 2010·Current Opinion in Neurology·Jorge J Riera, Akira Sumiyoshi
Oct 5, 2010·Journal of Neurophysiology·Suresh D Muthukumaraswamy
May 7, 2020·Reviews in the Neurosciences·Rebecca McMillan, Suresh D Muthukumaraswamy
Sep 6, 2018·Translational Psychiatry·Paul J Fitzgerald, Brendon O Watson

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