ИСТИНА

Illusory self-motion (vection) describes the sensation of ego-motion in the absence of physical movement. It is suggested that the illusion is caused by the sensory conflict between visual and vestibular systems which manifested in discomfort (nausea) and changes of eye movements. Here we developed a method of quantitative evaluation of vestibular function disturbances based on eye movement characteristics. The study involved 15 well prepared (figure skaters) and 15 poorly prepared (not athletes) to vestibular loads participants. The vection illusion was initiated with the help of CAVE virtual reality system. To evaluate the vestibular dysfunctions eye movement characteristics during the vection illusion experience were analyzed. In addition the SSQ test was performed to evaluate the strength of discomfort. Results showed that the vection illusion experience caused an optokinetic nystagmus which was more pronounced in well prepared than in poorly prepared participants. The scanpaths were also different for both groups: more blinks and fixations were revealed for athletes. Average values of saccade amplitudes were also significantly fewer for athletes. Total scores obtained by the SSQ questionnaire were consistent with the eye movements. The changes of eye movement characteristics may be considered as a compensatory mechanism to reduce the sensory conflict.