The brain bioelectric activity of the Belarusian persons irradiated in utero as a result of Chernobyl accident
Author: Igumnov S.
Reference: Activitas Nervosa Superior Rediviva. — 2009. — Vol. 51, № 1–2. — P. 55–60.
Keywords: BEA, Belorus, borderline EEG, IQ
Abstract: OBJECTIVE: The study examined the formation of bioelectric activity (BEA) of the brain of 250 children at the age of 6–7, 10–12 and 15–16 years from regions highly contaminated by Chernobyl fallout, who were irradiated in the prenatal period at the time of the Chernobyl accident in 1986. These children were compared with a control group of 250 children of the same age from non-contaminated areas of Belarus.
METHODS: The examination included visual and computerized analysis of EEG as well as psychiatric examination and assessment of intellectual level.
RESULTS: In the both groups of children at the age of 6–7 the dominant were the variants of age norms (46.4% vs 44.8%; p=0.592) and synchronized (borderline) EEG (26.4% vs 28.0%; P=0.763). Quite noticeable was the relevant frequency of the slow type of EEG (19.2% vs 18.4%; p=0.820) as well as paroxysmal activity (8.0% vs 8.8%; p=0.830) in the both groups. At the age of 15–16 in the both groups we registered relevant decrease of index of θ- and δ-activity. The slow type of EEG in most cases was transformed into the age norm and synchronized type of EEG. The correlation analysis showed that the intellectual level of children (IQ) estimated by Wechsler Intelligence Scale (WISC-III) was in the direct proportion to spectral power of α-diapason in frontal lobes of the brain (r=0.38 in the both groups). Mental deficiency of children of the both groups was accompanied by the decreased level of the coherency of α-diapason. When comparing the results of BEA research with the dosimetric data we found no relevant correlation of these indices. The children with different EEG types did not demonstrate any relevant differences of medium doses of antenatal exposure.
CONCLUSIONS: The revealed changes of BEA of the brain show distinct age dependency. Their frequency in the cohort of persons exposed to antenatal irradiation did not have relevant differences from that in control group. (full text available on web)
URL: http://www.rediviva.sav.sk/51i12/55.pdf
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