Stimulus Specificity of Phase-Locked and Non-Phase-Locked 40 Hz Visual Responses in Human Export

@article{citeulike:921478, abstract = {Considerable interest has been raised by non-phase-locked episodes of synchronization in the gamma-band (30-60 Hz). One of their putative roles in the visual modality is feature-binding. We tested the stimulus specificity of high-frequency oscillations in humans using three types of visual stimuli: two coherent stimuli (a Kanizsa and a real triangle) and a noncoherent stimulus ("no-triangle stimulus"). The task of the subject was to count the occurrences of a curved illusory triangle. A time-frequency analysis of single-trial EEG data recorded from eight human subjects was performed to characterize phase-locked as well as non-phase-locked high-frequency activities. We found in early phase-locked 40 Hz component, maximal at electrodes Cz-C4, which does not vary with stimulation type. We describe a second 40 Hz component, appearing around 280 msec, that is not phase-locked to stimulus onset. This component is stronger in response to a coherent triangle, whether real or illusory: it could reflect, therefore, a mechanism of feature binding based on high-frequency synchronization. Because both the illusory and the real triangle are more target-like, it could also correspond to an oscillatory mechanism for testing the match between stimulus and target. At the same latencies, the low-frequency evoked response components phase-locked to stimulus onset behave differently, suggesting that low- and high-frequency activities have different functional roles.}, address = {Brain Signals and Processing Laboratory, Institut National de la Sant\'{e} et de la Recherche M\'{e}dicale, Lyon, France.}, author = {Tallon-Baudry, C. and Bertrand, O. and Delpuech, C. and Pernier, J.}, citeulike-article-id = {921478}, citeulike-linkout-0 = {http://www.jneurosci.org/cgi/content/abstract/16/13/4240}, citeulike-linkout-1 = {http://view.ncbi.nlm.nih.gov/pubmed/8753885}, citeulike-linkout-2 = {http://www.hubmed.org/display.cgi?uids=8753885}, day = {1}, issn = {0270-6474}, journal = {The Journal of Neuroscience}, keywords = {binding, eeg, gamma, kanizsa, objects}, month = {July}, number = {13}, pages = {4240--4249}, posted-at = {2009-06-02 00:43:44}, priority = {0}, title = {Stimulus Specificity of Phase-Locked and Non-Phase-Locked 40 Hz Visual Responses in Human}, url = {http://www.jneurosci.org/cgi/content/abstract/16/13/4240}, volume = {16}, year = {1996} }

TY - JOUR ID - citeulike:921478 L3 - citeulike-article-id:921478 N2 - Considerable interest has been raised by non-phase-locked episodes of synchronization in the gamma-band (30-60 Hz). One of their putative roles in the visual modality is feature-binding. We tested the stimulus specificity of high-frequency oscillations in humans using three types of visual stimuli: two coherent stimuli (a Kanizsa and a real triangle) and a noncoherent stimulus ("no-triangle stimulus"). The task of the subject was to count the occurrences of a curved illusory triangle. A time-frequency analysis of single-trial EEG data recorded from eight human subjects was performed to characterize phase-locked as well as non-phase-locked high-frequency activities. We found in early phase-locked 40 Hz component, maximal at electrodes Cz-C4, which does not vary with stimulation type. We describe a second 40 Hz component, appearing around 280 msec, that is not phase-locked to stimulus onset. This component is stronger in response to a coherent triangle, whether real or illusory: it could reflect, therefore, a mechanism of feature binding based on high-frequency synchronization. Because both the illusory and the real triangle are more target-like, it could also correspond to an oscillatory mechanism for testing the match between stimulus and target. At the same latencies, the low-frequency evoked response components phase-locked to stimulus onset behave differently, suggesting that low- and high-frequency activities have different functional roles. IS - 13 JF - The Journal of Neuroscience SN - 0270-6474 AD - Brain Signals and Processing Laboratory, Institut National de la Santé et de la Recherche Médicale, Lyon, France. EP - 4249 TI - Stimulus Specificity of Phase-Locked and Non-Phase-Locked 40 Hz Visual Responses in Human VL - 16 SP - 4240 KW - binding KW - eeg KW - gamma KW - kanizsa KW - objects AU - Tallon-Baudry, C AU - Bertrand, O AU - Delpuech, C AU - Pernier, J PY - 1996/07/01/ UR - http://www.jneurosci.org/cgi/content/abstract/16/13/4240 ER -