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Arquivos de Neuro-Psiquiatria

Print version ISSN 0004-282XOn-line version ISSN 1678-4227

Abstract

SA, Antonio Mauricio F. L. Miranda de; CAGY, Mauricio; LAZAREV, Vladimir V.  and  INFANTOSI, Antonio Fernando C.. Spectral F-Test power evaluation in the EEG during intermittent photic stimulaton. Arq. Neuro-Psiquiatr. [online]. 2006, vol.64, n.2a, pp.228-232. ISSN 0004-282X.  http://dx.doi.org/10.1590/S0004-282X2006000200011.

Intermittent photic stimulation (IPS) is an important functional test, which can induce the photic driving in the electroencephalogram (EEG). It is capable of enhancing latent oscillation’s manifestations not present in the resting EEG. However, for adequate quantitative evaluation of the photic driving, these changes should be assessed on a statistical basis. With this aim, the sampling distribution of spectral F test was investigated. On this basis, confidence limits of the SFT-estimate could be obtained for different practical situations, in which the signal-to-noise ratio and the number of epochs used in the estimation may vary. The technique was applied to the EEG of 10 normal subjects during IPS, and allowed detecting responses not only at the fundamental IPS frequency but also at higher harmonics. It also permitted to assess the strength of the photic driving responses and to compare them in different derivations and in different subjects.

Keywords : EEG; intermittent photic stimulation; photic driving; Spectral F test; quantitative analysis.

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