Biomedical subjects

S A Isaichev

Publications and source records attributed to S A Isaichev.

2 recordsLinked to original sources

PubMed1990

Population-genetics approach to the genetics of human behaviour.

Invariant values of inheritance factors within and between different populations can show the existence of and measure the degree of genetic determination of behavioural characters. The absence of inbred depression of quantitative behavioural characters in isolated populations of highland inhabitants of Daghestan is demonstrated by means of comparative analysis of the mean population values of psychophysiological characters in outbred, moderately isolated, and extremely isolated (and inbred) populations. The absence of pronounced adverse effects of inbred marriages, known as the 'Daghestan phenomenon', is explained by the antiquity of the native populations and the severe ecological conditions under which these populations live which have led to elimination of carriers of hereditary diseases and other detrimental phenotypes.

Adolescent↗

PubMedDate not supplied

Rhythmic alpha-activity generators in the human EEG.

This study was designed to locate the neuronal mechanisms of rhythmic activity in the human brain in the alpha-rhythm range using an equivalent dipole model. The experiments approach used here is based on using the "imposed rhythm" phenomenon, whereby a light stimulus flashing with a frequency close to the frequency of the individual alpha rhythm increases its power in the EEG spectrum. The results obtained showed that the activity of the structures generating the alpha rhythm could be differentiated by using a specific photostimulation frequency and were located by constructing a dipole model. Two sources of alpha-rhythm generation were found, located in the thalamic structures of the brain and operating over a narrow-band frequency range with maximum response resonance frequencies of 10.1 and 10.5 Hz.

Adult↗