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Assessing directionality of neural communication from macroscopic human brain signals| old_uid | 3433 |
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| title | Assessing directionality of neural communication from macroscopic human brain signals |
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| start_date | 2007/11/12 |
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| schedule | 12h-13h |
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| online | no |
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| summary | Induced gamma-band-responses (iGBRs; oscillations >30Hz) were repeatedly found to be modulated by familiar and unfamiliar objects in macroscopic human brain signals (MEG/EEG). This frequency-specific power change seems to indicate the dynamic formation of local neuronal assemblies during the activation of cortical object representations. As analytically power increase merely reflects the neural response of a single location, phase-synchrony was introduced to investigate the formation of large-scale networks between spatially distant brain sites. However, if we are interested in how distinct brain sites interact (to uncover the temporal hierarchy between them), classical phase-synchrony does not suffice. The current report will be focused on how the directionality of oscillatory interactions between brain sources can be assessed on the basis of a multivariate Granger-Causality coupling-measure. Specifically, this report should illustrate that uncovering the directionality of cortical information flow (feed-forward/-backward) may shed new light on cortical mechanisms of human object recognition |
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| responsibles | Baillet |
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