Neurophysiological investigation of the basis of the fMRI signal. Export

@article{citeulike:335441, abstract = {Functional magnetic resonance imaging (fMRI) is widely used to study the operational organization of the human brain, but the exact relationship between the measured fMRI signal and the underlying neural activity is unclear. Here we present simultaneous intracortical recordings of neural signals and fMRI responses. We compared local field potentials (LFPs), single- and multi-unit spiking activity with highly spatio-temporally resolved blood-oxygen-level-dependent (BOLD) fMRI responses from the visual cortex of monkeys. The largest magnitude changes were observed in LFPs, which at recording sites characterized by transient responses were the only signal that significantly correlated with the haemodynamic response. Linear systems analysis on a trial-by-trial basis showed that the impulse response of the neurovascular system is both animal- and site-specific, and that LFPs yield a better estimate of BOLD responses than the multi-unit responses. These findings suggest that the BOLD contrast mechanism reflects the input and intracortical processing of a given area rather than its spiking output.}, address = {Max Planck Institute for Biological Cybernetics, Tuebingen, Germany. nikos.logothetis@tuebingen.mpg.de}, author = {Logothetis, N. K. and Pauls, J. and Augath, M. and Trinath, T. and Oeltermann, A.}, citeulike-article-id = {335441}, citeulike-linkout-0 = {http://dx.doi.org/10.1038/35084005}, citeulike-linkout-1 = {http://dx.doi.org/10.1038/412150a0}, citeulike-linkout-2 = {http://view.ncbi.nlm.nih.gov/pubmed/11449264}, citeulike-linkout-3 = {http://www.hubmed.org/display.cgi?uids=11449264}, day = {12}, doi = {10.1038/35084005}, issn = {0028-0836}, journal = {Nature}, keywords = {09-016, fmri, method}, month = {July}, number = {6843}, pages = {150--157}, posted-at = {2009-04-13 03:24:38}, priority = {5}, title = {Neurophysiological investigation of the basis of the fMRI signal.}, url = {http://dx.doi.org/10.1038/35084005}, volume = {412}, year = {2001} }

TY - JOUR ID - citeulike:335441 L3 - citeulike-article-id:335441 N2 - Functional magnetic resonance imaging (fMRI) is widely used to study the operational organization of the human brain, but the exact relationship between the measured fMRI signal and the underlying neural activity is unclear. Here we present simultaneous intracortical recordings of neural signals and fMRI responses. We compared local field potentials (LFPs), single- and multi-unit spiking activity with highly spatio-temporally resolved blood-oxygen-level-dependent (BOLD) fMRI responses from the visual cortex of monkeys. The largest magnitude changes were observed in LFPs, which at recording sites characterized by transient responses were the only signal that significantly correlated with the haemodynamic response. Linear systems analysis on a trial-by-trial basis showed that the impulse response of the neurovascular system is both animal- and site-specific, and that LFPs yield a better estimate of BOLD responses than the multi-unit responses. These findings suggest that the BOLD contrast mechanism reflects the input and intracortical processing of a given area rather than its spiking output. IS - 6843 JF - Nature SN - 0028-0836 AD - Max Planck Institute for Biological Cybernetics, Tuebingen, Germany. nikos.logothetis@tuebingen.mpg.de EP - 157 TI - Neurophysiological investigation of the basis of the fMRI signal. VL - 412 SP - 150 KW - 09-016 KW - fmri KW - method AU - Logothetis, NK AU - Pauls, J AU - Augath, M AU - Trinath, T AU - Oeltermann, A PY - 2001/07/12/ UR - http://dx.doi.org/10.1038/35084005 ER -