V.I. Mirgorodsky
Ph.D. (Phys.-Math.), Professor, Leading Research Scientist,
Fryazino Branch of the Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences
E-mail: vim288@ms.ire.rssi.ru
V.V. Gerasimov
Ph.D. (Phys.-Math.), Senior Research Scientist,
Fryazino Branch of the Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences
E-mail: vvg_288@ms.ire.rssi.ru
S.V. Peshin
Ph.D. (Phys.-Math.), Senior Research Scientist,
Fryazino Branch of the Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences
E-mail: svp288@ms.ire.rssi.ru

The purpose of the work was to carry out a statistical analysis of the results of experiments performed earlier by the authors on registration of spontaneous periodical acoustomyographic signals obtained from the leads located at the temples of the subjects. Standard statistical methods were used to perform the work.

The purpose of the work was to perform a statistical analysis of the results of experiments performed earlier by the authors on registration of spontaneous periodic acoustic-motographic signals (SPAS) obtained from leads located at the temples of the subjects.

In total, the results of 104 experiments, consisting of their two stages, were processed, the first of which, called the "calculation", the subject, lying in the supine position with closed eyes, was motivated to say to himself the multiplication tables, which implied the performance of mental work. In the second stage, called relaxation, the subject, without changing the position, was motivated to fall asleep.

The processing of the signals received during the experiments consisted in the visual (on the computer monitor) detection of the SPAS series and in determining their duration. As a result, for each experiment, the sums of the time intervals, during which SPAS was observed, separately expressed from each of the leads, from the left and right temples, were expressed as percentages with respect to the entire time of the experiment.

Standard statistical methods were used to perform the work. The median method was used for averaging, which is due to the non-Gaussian character of the distributions of experimental data.

Based on the results of 104 experiments with 19 subjects, it was shown that with the location of acoustic receivers on leads in the left and right temporal hollows of the subjects' heads, an average of 12% of the time of the experiments observed SPAS. From the above it follows that the use of SPAS signals in practice should not cause difficulties in their observation.

It was experimentally shown that when performing two-stage experiments, at the first stage of which the subject was motivated to "count", and on the second stage, SPAS relaxation was observed in different numbers. For the younger age group (with age less than 26 years), SPAS were relatively rare. At the same time, at the first stage, when motivated to "score", SPAS arose somewhat more often than when the subjects were motivated to relax. For the older age group (with the age of more than 46 years), SPAS appeared much more often, and with "counting" they were significantly less than in relaxation. From the above it follows that SPAS is possibly associated with the relaxation of subjects or directly with higher nervous activity and, in principle, can represent a new channel for obtaining diagnostic information.

Also shown is the presence of a significant spread in the duration of manifestation of SPAS for the same subjects in different experiments. This indicates the dependence of SPAS on the psychophysiological state of the subjects. Nevertheless, it is shown that there are statistically distinguishable values of relative SPAS durations recorded from different subjects. While with some subjects signals are relatively rare – in 0.5% of the time of the experiments, for other subjects the average relative time of manifestation of SPAS can reach 90% or more from the time of the experiments. From the above it follows that the relative duration of the manifestation of SPAS can provide information about the individual properties of the subjects, for example, the predispositions to some diseases, etc.

Analysis of SPAS, recorded from leads located on the left and right temporal cavities, showed that they differ for different age groups. The comparison showed that for the younger age group, the prevalence of SPAS durations is observed on the right, while for the older age group there is a predominance of SPAS durations on the left.