Abstract：
:Partial coherence estimate between two signals removing the contribution of a periodic, deterministic one is proposed for measuring the coherence between two ongoing eletroencephalografic (EEG) activities collected at distinct cortical regions under sensory stimulation. The estimator expression was derived and shown to be independent of the stimulating signal. Simulations were used for obtaining the critical values for this coherence estimate. The technique was also evaluated throughout simulations and next applied to the EEG from 12 subjects under intermittent photic stimulation at 4 and 6 Hz. In both simulation and EEG data, major differences between partial and simple coherences occurred at the stimulation frequency and harmonics, except for those falling within the alpha band. These findings suggest that the technique is highly selective in removing the contribution of the periodic source. They also indicate high coherence values of the ongoing EEG within the alpha band.
journal_name
Med Biol Eng Computjournal_title
Medical & biological engineering & computingauthors
Miranda de Sá AM,Infantosi AFdoi
10.1007/s11517-007-0191-0subject
Has Abstractpub_date
2007-07-01 00:00:00pages
635-42issue
7eissn
0140-0118issn
1741-0444journal_volume
45pub_type
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