Velazquez JLP, Dominguez LG, Nenadovic V, Wennberg RA. Experimental observation of increased fluctuations in an order parameter before epochs of extended brain synchronization.
J Biol Phys 2010;
37:141-52. [PMID:
22210968 DOI:
10.1007/s10867-010-9205-5]
[Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Accepted: 10/01/2010] [Indexed: 11/26/2022] Open
Abstract
The identification of epileptic seizure precursors has potential clinical relevance. It is conjectured that seizures may be represented by dynamical bifurcations and that an adequate order parameter to characterize brain dynamics is the phase difference in the oscillatory activity of neural systems. In this study, the critical point hypothesis that seizures, or more generally periods of widespread high synchronization, represent bifurcations is empirically tested by monitoring the growth of fluctuations in the putative order parameter of phase differences between magnetoencephalographic and electroencephalographic signals in nearby brain regions in patients with epilepsy and normal subjects during hyperventilation. Implications of the results with regard to epileptic phenomena are discussed.
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