Rau, R. and Raschka, C. and Koch, Horst J. (2002) Uniform decrease of alpha-global field power induced by intermittent photic stimulation of healthy subjects. BRAZILIAN JOURNAL OF MEDICAL AND BIOLOGICAL RESEARCH, 35 (5). pp. 605-611. ISSN 0100-879X
Full text not available from this repository. (Request a copy)Abstract
Nineteen-channel EEGs were recorded from the scalp surface of 30 healthy subjects (16 males and 14 females, mean age: 34 years, SD: 11.7 years) at rest and under trains of intermittent photic stimulation (IPS) at rates of 5, 10 and 20 Hz. Digitalized data were submitted to spectral analysis with fast fourier transformation providing 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 obtained under IPS. All subjects showed a photic driving effect at each rate of stimulation. GFP data were normally distributed, whereas ratios from photic, driving effect data showed no uniform behavior due to high interindividual variability. Suppression of alpha-power after IPS with 10 Hz was observed in about 70% of the volunteers. In contrast, ratios of alpha-power were unequivocal in all subjects: IPS at:20 Hz always led to a suppression of alpha-power. Dividing alpha-GFP with 20-Hz IPS by alpha-GFP at rest (R = alpha-GFP(IPS)/alpha-GFP(rest)) thus resulted in ratios lower than 1. We conclude that ratios from GFP data with 20-Hz IPS may provide a suitable paradigm for further investigations.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | EEG; MIGRAINE; TOPOGRAPHY; FEATURES; EEG; brain mapping; intermittent photic stimulation; IPS; global field power ratios |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Psychiatrie und Psychotherapie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 27 Oct 2021 04:22 |
| Last Modified: | 27 Oct 2021 04:22 |
| URI: | https://pred.uni-regensburg.de/id/eprint/40292 |
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