Kovalev, A. I.

Background. The study of the mechanisms of sensation, primarily visual, emergence under the influence of a light stimulus on a person is a classic task for psychological science. At the same time, little attention has been paid to the sensations arising from light exposure of the skin surface, despite the surprising results obtained in a well-known series of experiments by Russian psychologist A.N. Leontiev. The task of studying skin-optical sensitivity with the modern element base of experimental equipment is relevant from the point of view of the development of the general psychological theory of activity and understanding sensory-perceptual processes of sensation formation due to light exposure.
Objective of the study was to investigate the ability of subjects to recognize the effect of light on their skin surface. Methods. A specially designed experimental setup was used for the purpose of the study, which included a LED light source and a control programme. The experimental procedure involved the psychophysical method of two-alternative forced choice. The main experiment consisted of three series of cycles for each participant: first, 10 cycles were presented to fix the initial state; 100 cycles followed to train the subject; then, 10 cycles were used to fix the final state.
Sample. 12 participants took part in the experiment.
Results. showed that the number of correct answers when determining the cycle phase corresponding to the LED switching on, is significantly more than 50% (t = 10,992, df = 1414, p < 0.001).
Conclusion. The conclusions of A.N. Leontiev and N.B. Poznanskaya about the possibility of skin sensitivity to light exposure were confirmed. A biophysical hypothesis is proposed to explain the result.

Relevance. The study of the self-motion (“vection”) illusion is an important task for modern psychology and neuroscience due to the widespread use of virtual reality systems. The study of psychophysiological mechanisms of this phenomenon has particular importance as an example of intersensory interactions.

Objective. To study the psychophysiological mechanisms of the self-motion illusion in a virtual reality system using electroencephalography.

Methodology. Eleven healthy subjects took part in the experiment. The stimulation was a virtual opto-kinetic drum that rotated clockwise and counterclockwise around a vertical axis with angular velocities of 30, 45 and 60 angular deg/s. The duration of each rotation was 60 seconds. The subjects were presented with 18 rotations; there was a series with instructions for free viewing of the visual scene (3 speeds × 2 directions × 2 repetitions) and a series with instructions to fix the gaze in the center of the virtual scene (3 speeds ×2 directions × 1 repetition). After each rotation, the subjects filled out the “Simulator Sickness Questionnaire” and evaluated the intensity of the illusion on a 10-point scale. Stimulation was presented in the HTC Vive virtual reality helmet. Electroencephalogram recording during the observation of cylinder rotations was performed using Mitsar-EEG-10/70-201.

Results. Significant differences were found in the intensity of the illusion, the total score on the questionnaire, and the power of the alpha rhythm in the parietal zones, depending on the speed of rotation. The higher the rotational speed, the greater the values of these dependent variables. Large values for beta-rhythm power in the occipital areas were found in the series with fixed eyes, in the subjects with high values for the intensity of the illusion.

Conclusions. Differences were shown in the bioelectrical activity of the brain during the experience of the self-motion illusion, related to mechanisms of visual-vestibular integration and greater attention to the performance of the motor task of gaze fixation.

Background. Virtual reality technologies (VR) allow users to absorb a lot of visual information in a short time and have become an important feature in education. The advisability of using virtual reality as a tool to improve the learning processes in the modern digital environment is an open question. Despite some studies devoted to assessing the effectiveness of virtual reality applications to the education process, there are no clear conclusions on this issue.

Objective. The study of features of foreign language learning material using VR.

Design. 29 young participants (22 females, 7 males) with a high level of foreign language competence were selected. They received three types of stimuli: text, 2D video, and VR. The efficiency of their learning was tested with questions before and after each experiment. VR stimuli were presented by Samsung Gear VR.

Results. It was shown that “VR” and “Text” conditions were the most efficient material for foreign language learning as compared to the “2D-video” condition. The results also showed a strong negative correlation between the participants’ baseline level of knowledge and their knowledge gain under all experimental conditions.

Conclusion. VR offers an effective method for improving the process of learning, but traditional teaching methods still play an important role in education. Young people in the modern world have developed ways to use the VR as an educational tool.

Acknowledgments: The study was supported by the Russian Federal Property Fund grant No. 18-29-22049.

Relevance. It is one of very important tasks of modern neuroscience to investigate the psychological and psychophysiological mechanisms of body orientation processes. Particularly due to the growth in use of visualization and simulation technologies (virtual reality, projection displays, aircraft simulators). The application of such systems is often associated with mismatch between different sensory signals. One of the phenomena resulting from this mismatch is the self-motion illusion – the perception of own movement by a motionless person observing a moving visual stimulus occupying a large part of field of view.

Objective. Investigation the role of optokinetic nystagmus in self-motion illusion. The virtual optokinetic drum rotating at 30, 45 and 60 deg/s was used as a stimulus. The drum was presented using CAVE virtual reality system. 17 healthy participants took part in the experiment. The slow phases of nystagmus during self-motion illusion perception were analyzed. 

Results. The more the drum rotation speed, the more the illusion intensity and slow phases duration. Also the disturbances in slow phase realization led to increase the illusion intensity. The restoration of nystagmus reduced the illusion. Thus it was found that optokinetic nystagmus is a component of a human space orientation system and the nystagmus also adjusts the illusion perception. The effectiveness of application of CAVE virtual reality system in complicated cognitive processes investigation was proved.