Perception's shadow: long-distance synchronization of human brain activity Export

@article{Rodriguez1999, abstract = {Transient periods of synchronization of oscillating neuronal discharges in the frequency range 30-80 Hz (gamma oscillations) have been proposed to act as an integrative mechanism that may bring a widely distributed set of neurons together into a coherent ensemble that underlies a cognitive act. Results of several experiments in animals provide support for this idea. In humans, gamma oscillations have been described both on the scalp (measured by electroencephalography and magnetoencephalography) and in intracortical recordings, but no direct participation of synchrony in a cognitive task has been demonstrated so far. Here we record electrical brain activity from subjects who are viewing ambiguous visual stimuli (perceived either as faces or as meaningless shapes). We show for the first time, to our knowledge, that only face perception induces a long-distance pattern of synchronization, corresponding to the moment of perception itself and to the ensuing motor response. A period of strong desynchronization marks the transition between the moment of perception and the motor response. We suggest that this desynchronization reflects a process of active uncoupling of the underlying neural ensembles that is necessary to proceed from one cognitive state to another.}, address = {Laboratoire de Neurosciences Cognitives et Imagerie C\'{e}r\'{e}brale (LENA), CNRS UPR 640, H\^{o}pital de la Salp\'{e}tri\`{e}re, Paris, France.}, author = {Rodriguez, Eugenio and George, Nathalie and Lachaux, Jean-Philippe and Martinerie, Jacques and Renault, Bernard and Varela, Francisco J.}, citeulike-article-id = {1304034}, citeulike-linkout-0 = {http://dx.doi.org/10.1038/17120}, citeulike-linkout-1 = {http://dx.doi.org/10.1038/397430a0}, citeulike-linkout-2 = {http://view.ncbi.nlm.nih.gov/pubmed/9989408}, citeulike-linkout-3 = {http://www.hubmed.org/display.cgi?uids=9989408}, day = {4}, doi = {10.1038/17120}, issn = {0028-0836}, journal = {Nature}, keywords = {neurodynamics, synchronization}, month = {February}, number = {6718}, pages = {430--433}, posted-at = {2008-06-29 21:28:10}, priority = {2}, title = {Perception's shadow: long-distance synchronization of human brain activity}, url = {http://dx.doi.org/10.1038/17120}, volume = {397}, year = {1999} }

TY - JOUR ID - Rodriguez1999 L3 - citeulike-article-id:1304034 N2 - Transient periods of synchronization of oscillating neuronal discharges in the frequency range 30-80 Hz (gamma oscillations) have been proposed to act as an integrative mechanism that may bring a widely distributed set of neurons together into a coherent ensemble that underlies a cognitive act. Results of several experiments in animals provide support for this idea. In humans, gamma oscillations have been described both on the scalp (measured by electroencephalography and magnetoencephalography) and in intracortical recordings, but no direct participation of synchrony in a cognitive task has been demonstrated so far. Here we record electrical brain activity from subjects who are viewing ambiguous visual stimuli (perceived either as faces or as meaningless shapes). We show for the first time, to our knowledge, that only face perception induces a long-distance pattern of synchronization, corresponding to the moment of perception itself and to the ensuing motor response. A period of strong desynchronization marks the transition between the moment of perception and the motor response. We suggest that this desynchronization reflects a process of active uncoupling of the underlying neural ensembles that is necessary to proceed from one cognitive state to another. IS - 6718 JF - Nature SN - 0028-0836 AD - Laboratoire de Neurosciences Cognitives et Imagerie Cérébrale (LENA), CNRS UPR 640, Hôpital de la Salpétrière, Paris, France. EP - 433 TI - Perception's shadow: long-distance synchronization of human brain activity VL - 397 SP - 430 KW - neurodynamics KW - synchronization AU - Rodriguez, Eugenio AU - George, Nathalie AU - Lachaux, Jean-Philippe AU - Martinerie, Jacques AU - Renault, Bernard AU - Varela, Francisco PY - 1999/02/04/ UR - http://dx.doi.org/10.1038/17120 ER -