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Disrupted Development of the Dominant Hemisphere Following Prenatal Irradiation

Received March 11, 2007; revised June 2, 2007; accepted July 6, 2007. Drs. Loganovsky, Loganovskaja, Antipchuk, and Bomko are affiliated with the Department of Radiation Psychoneurology at the Institute for Clinical Radiology, State Institution (SI) Research Center for Radiation Medicine (RCRM), Academy of Medical Sciences (AMS), of Ukraine; Dr. Nechayev is affiliated with the Department of Radiation Hygiene at the Institute for Radiation Hygiene and Epidemiology, SI RCRM, AMS, of Ukraine. Address correspondence to Prof. Konstantin N. Loganovsky, Radiation Psychoneurology, State Institution Research Center for Radiation Medicine, Academy of Medical Sciences of Ukraine, 53 Melnikov St., Kiev 04050, Ukraine; loganovsky{at}windowslive.com (e-mail).

One hundred children, exposed prenatally to radiation after the Chernobyl nuclear power plant accident, and 50 nonexposed classmates were examined between the ages of 11 and 13 years old using neuropsychiatric tests, WISC, EEG, and visual evoked potentials. Individual prenatal radiation doses were reconstructed for all examined children. The exposed children were found to have more neuropsychiatric disorders, left-brain neurological signs, lower full-scale and verbal IQ, IQ discrepancies with verbal decrement, disorganized EEG patterns, an excess of lateralized-to-left frontotemporal region delta and beta power with depression of theta and alpha power, and interhemispheric inversion visual information processing. Mothers’ mental health, stress, and prenatal irradiation contributed to these effects, along with several confounding factors

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