Постуральные ответы на движущиеся звуковые образы в зависимости от ведущей сенсорной модальности при ориентации в пространстве

Abstract

Influences of individual characteristics of sensory information processing in humans on postural responses to approaching and receding sound images were investigated. Two groups of subjects with different cognitive style were examined (8 field-dependent and 9 field-independent individuals). Stabilographic signals before, during and after sound stimulation of different types (approaching, receding and unmoving sound images) were recorded, and the following characteristics of the center of pressure (COP) sway along sagittal axis were analyzed: COP trajectory length, average linear velocity, COP shift, and variation. Substantial differences were revealed between the strategies of equilibrium maintenance in the two groups of subjects. COP variation was higher for the field-independent group of subjects in all time intervals. Comparative analysis of COP characteristics received during sound stimulation showed that COP trajectory length and average linear velocity in the field-independent group was higher than ones in the field-dependent group only for receding sound images. Field-dependent subjects demonstrated reliable backward COP shift during listening by subject to approaching sound images. Unmoving sound images received during their listening did not influence any of the studied COP characteristics. The differences in postural control system responses, which were revealed, are in good agreement with the idea about predominant usage of sensory information of different modalities by the investigated groups of subjects: exteroceptive information in field-dependent, and proprioceptive in field-independent individuals.