Characteristic changes in the EEG pattern in patients with depressive disorder are related to spatial phenomena in the brain. These can be measured by the signal coherence (similar waveform) of two electrode positions, i.e. brain regions, of a certain frequency band in the EEG. High coherence between EEG signals of two brain regions is interpreted as increased functional cooperation between these regions.
18 healthy women and 18 women with major depressive disorder were exposed and sham-exposed in randomized order. EEG coherence between frontal, temporal, parietal and occipital electrode channels was considered.
|Exposure duration||continuous for 30 min|
Significant changes in EEG coherence caused by microwave exposure could not be detected on the group level, but only in individual persons: Increased EEG coherence was observed for healthy women in theta waves (3 subjects) and alpha waves (2 subjects) over the frontal and temporal region, as well as decrease in alpha waves over the parietal and occipital region. In women with major depression significant changes in EEG coherence were observed in beta wave 2 (2 subjects) over frontal and temporal region and in alpha wave (3 subjects) over temporal and parietal region. The rate of individual subjects affected by microwave exposure was the same in both groups.