PMID: 2503354Jun 1, 1989Paper

Frequency analytic EEG study on the topic of temporal function disorders in transsexuality

EEG-EMG Zeitschrift für Elektroenzephalographie, Elektromyographie und verwandte Gebiete
T GrasserG Kockott

Abstract

A high rate of (temporal) EEG abnormalities within the group of transsexual patients has been previously described. These reports however were based on visual EEG analyses, which were not sufficiently statistically supported. It therefore seemed necessary to test this observations by utilizing quantitative frequency EEG analysis by using a larger group of transsexuals (n = 33). Fourier transformed data were recordings from T3-A1, T3-P3, T5-Cz, 01-Cz. The power of the delta-, theta-, alpha, and beta-bands were calculated as the percent of the total power (1,00-30,00 Hz). Different ratios of the absolute power values were computed. No significant differences of frequency-band related power, global power or power ratios between patients and normal subjects were found. There was also no separation on the basis of the genotypic sex of the subjects (Mann-Whitney-test). However 7 EEG's (21%) of the transsexual patients showed according to our interpretation temporo-parietal abnormalities.

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