REAL

Intermittent 20-HZ-photic stimulation leads to a uniform reduction of alpha-Global Field Power in healthy volunteers

Rau, R. and Raschka, C. and Koch, H. J. (2001) Intermittent 20-HZ-photic stimulation leads to a uniform reduction of alpha-Global Field Power in healthy volunteers. Acta Physiologica Hungarica, 88 (1). pp. 81-85. ISSN 0231-424X

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Abstract

19-channel-EEGs were recorded from scalp surface of 30 healthy subjects (16m, 14f, mean age: 34 ys, SD: 11.7 ys) at rest and under IPS (Intermittent Photic Stimulation) at rates of 5, 10 and 20 Hertz (Hz). Digitalized data underwent spectral analysis with fast fourier transformation (FFT) yielding the basis for the computation of global field power (GFP). For quantification GFP values in the frequency ranges of 5, 10 and 20 Hz at rest were divided by the corresponding data gained under IPS. While ratios from PDE data showed no stable parameter due to high interindividual variability, ratios of alpha-power turned out to be uniform in all subjects: IPS at 20 Hz always led to a suppression of alpha-power. Dividing alpha-GFP at rest by alpha-GFP under 20-Hz IPS thus resulted in a ratio <1. We conclude that ratios from GFP data are a stable diagnostic paradigma.

Item Type: Article
Subjects: R Medicine / orvostudomány > R1 Medicine (General) / orvostudomány általában
Depositing User: xFruzsina xPataki
Date Deposited: 28 Oct 2017 18:53
Last Modified: 30 Nov 2021 00:15
URI: http://real.mtak.hu/id/eprint/63354

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