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Enhanced measured synchronization of unsynchronized sources: significance for brain recordings

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The analysis of synchronization, particularly phase locking, is being increasingly used in neuroscience to explore coordinated brain activity. The application of this methodology to magnetoencephalographic (MEG) and electroencephalographic (EEG) recordings would seem promising because these two recording techniques have great temporal resolution. However, current methods of synchronization analysis applied to raw MEG/EEG data may not be as physiologically sound as previously thought. In this work we present a model of brain activity based on random current dipoles that reproduces the main characteristics observed in measurements of real data synchronization, even when no synchronized activity is taking place among the sources. In particular, we show that the enhanced local synchronization, previously described in some studies of epileptic seizures, may result from the activity of only a few unsynchronized sources.

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Correspondence to Ramon Guevara.

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Dominguez, L.G., Wennberg, R., Velazquez, J.L.P. et al. Enhanced measured synchronization of unsynchronized sources: significance for brain recordings. BMC Neurosci 8, P41 (2007) doi:10.1186/1471-2202-8-S2-P41

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Keywords

  • Animal Model
  • Real Data
  • Brain Activity
  • Current Method
  • Temporal Resolution