Geophysical processes and biosphere: article

Аnnotation: The synchronization of the mice motor activity, which reflects the activity-rest cycle, with variations in the X -component of the geomagnetic field vector (BOXX) in the range of fluctuations from 10 to 120 minutes was studied. The indicator of motor activity was the percentage of pixels on the video recording that changed their intensity in 10 sec. The experiment was performed simultaneously in 16 males of the C57BL/6 line in October, 2019 in Moscow. The mice were kept single in a plastic box ( t = 22-26 °С) under an artificial 12-hour light regime and free access to water and food. The analysis of the degree of similarity of the rhythm of biological and BOXX indicators processes was carried out for each animal by evaluating the degree of similarity of their Fourier spectra for each the day and night intervals. Analysis of the time series averaged over the group showed that almost all harmonics in the interval of 50-120 min correspond to equal harmonics of the BOXX. The cross-correlation function of two series has a statistically significant absolute maximum with a zero time lag between the series. On average, 18 % of individual segments showed synchronization between the spectra of «activity-rest» cycle and BOXX. This result indicates the adjustment of the biological rhythm for the variations of the geophysical rhythm, which is similar effect of adjusting the rhythms of heart and brain human activity to an external rhythm generator - the geomagnetic field.