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Non-invasive investigation of large-scale neural interactions in humans| old_uid | 436 |
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| title | Non-invasive investigation of large-scale neural interactions in humans |
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| start_date | 2006/01/09 |
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| schedule | 12h-13h |
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| online | no |
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| summary | The emergence of robust and highly efficient information processing in the brain not despite but because of the myriads of neurons and the large complexity of processes affecting neuronal functions is fascinating. Given the large number of neurons optimal performance relies on optimal communication and coordination.
Temporal relations (synchronization) in regular occurring variation of neuronal activity (oscillations) may represent a mechanism for long-range communication. Studies in the insect olfactory system provide direct evidence that oscillatory communication is behaviourally relevant. These and other studies point towards several mechanism that are at work at different spatial scales and seem to support interneuronal communication: Filtering and resonance phenomena describe the dependence of neuronal activity on the frequency content of the input. Structural connectivity leads to networks with particular properties in which specific spatio-temporal pattern of excitation and inhibition implements specific computations.
New analysis techniques allow the non-invasive investigation of frequency-specific long-range communication with Magnetoencephalography.
Recent experimental data revealed new information about the role of oscillatory synchronization in long-range communication. First, there is new evidence that neural synchronization in the beta frequency band plays an important role in long-range communication. Second, the importance of desynchronization is emphasized by recent studies. Third, several studies demonstrate direct relations between specific synchronization pattern and behaviour. |
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| responsibles | Baillet |
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