Multisensory alterations in visual, vestibular and proprioceptive cues for modeling of postural control

In sensory inputs of postural control, visual and vestibular inputs, as well as both proprioceptive and tactile somatosensory inputs, are required to control posture-regulating muscles in the whole body, especially in the lower limbs and trunk. Changes in multisensory inputs elicit appropriate changes immediately in posture corresponding to the sensory information. Because the central nerve system is complex, the mechanism by which this regulation occurs is still unknown. In this study, we set up experiments with measurements of muscular activities by multisensory alterations to investigate the tonus control in postural control. We focus on visual, vestibular and proprioceptive sensations in this paper. From the results of the positions and the standard deviations of CoPs, we confirm that the experiments were well-done to our aim. In the standard deviations of CoPs, the effects of instability rise up in the order of GVS, closed eyes and vibration. However, it is interesting that these are not simple summation but with something to be integrated. From the result of EMGs, comparing with control conditions, almost muscular activities rise up in several conditions. However, it is difficult to find regularity between sensations and muscular activities. We should continue to analyze the results for our hypothesis.