Changes in neurodynamic parameters of the human brain during an individual annual cycle

Neurodynamic parameters of the human brain and their changes depending on the trimester of an individual annual cycle (IAC), which lasts from one birthday to the next, were studied. In the course of a year, fourfold examination (in February, April, July, and October) of 124 men and 242 women aged from 18 to 20 years was carried out. According to psychological characteristics, the examined subjects were divided into introverts and extroverts. The strength and mobility of nervous processes in extrovert men tended to decrease in the fourth trimester of the IAC, simultaneously with a decrease in the overall state of health. Introvert men exhibited a lower brain efficiency than extrovert men; changes in their brain functional mobility during an IAC were more pronounced than in the case of extrovert men; the lowest parameters were recorded in the second trimester. Annual changes in neurodynamic parameters in women were smaller than in men.