The bioelectrical activity of the brain of suicidals has specific features.

Investigate neurophysiological features associated with high suicidal risk (SR) in dementias.

An electroencephalographic study of brain was performed in 66 patients with dementia, of which 33 (with high SR) were included in the main group, the other 33 (with low SR) – in the control group.

SR correlates include an increase in the spectral density and amplitude (in μV) of the α-rhythm in the right central (C4) (109.4) – in the main group, compared with (64.5) – in the control; in the temporal areas (T4) (132.2) - in the main group, (70.0) – in the control group (p<0.001). The predominance of the spectral density of the slow θ-rhythm over the entire surface of the brain (p<0.001) and δ-rhythm in the projection of Fp2 (82.3) – in the main and (116.1) – in the control groups (p<0.001), F3 (54.80) and (68.1), respectively, (p<0.05), F4 (52.4) and (67.3), respectively, (p<0.01), C4 (52.0) and (62.0), respectively (p<0.05), P3 (44.4) and (58.9), respectively, (p<0.01), O1 (67.6) and (89.41), (p<0.001), O2 (68.5) and (85.8), respectively (p<0.001) are a predictor of low SR in dementias.

With the progression of changes in the brain in dementias SR decreases. In the initial phases of the dementing process with a relatively preserved functional capacity of the brain SR is high.

No significant relationships.