title: [Comparative study of the gamma-rhythm in the norm, pre-examination stress and patients with the first depressive episode].
abstract: The work gives the results of comparative analysis of gamma-rhythm (30-40 Hz) spectral power and synchronization indices in the healthy subjects both in normal situation and before the examination with that of depressive patients with the first episode, in the rest condition and during cognitive tests performance. It is demonstrated that gamma-rhythm spectral power in frontal and temporal areas of depressive patients was significantly higher than that in the norm. In stressful situation the number of differences of healthy subjects from depressive patients decreased in the rest condition and in Kraepelin test. Spatial imagination revealed more significant differences between depressive patients and healthy subjects both in normal and in stressful situations. Gamma-rhythm synchronization level was the same in healthy subjects both in the rest condition and during the tests performance, but in stressful situation it increased in the latter situation as well as in depressive patients. Thus, in the most cases stressful situation decreases the differences of EEG indices between healthy subjects and depressive patients both in the rest condition (by spectral power) and during the tests performance (by both indices). This may point out stress as the "trigger" of depression.
authors.forename: V B
authors.initials: VB
authors.lastname: Strelets
authors.forename: Zh V
authors.initials: ZhV
authors.lastname: Garakh
authors.forename: V Iu
authors.initials: VIu
authors.lastname: Novototskiĭ-Vlasov
mesh_terms: D000293:Adolescent; D000328:Adult; D003863:Depression / Q000523:psychology*; D004569:Electroencephalography; D005260:Female; D005625:Frontal Lobe / Q000502:physiology; D006801:Humans; D008297:Male; D013315:Stress, Psychological / Q000523:psychology*; D013702:Temporal Lobe / Q000502:physiology