Abstract
Vision contributes fundamentally to the control of the standing posture. The illusion of self motion falsely perceived (vection) increases postural sway while standing. In this paper we examine the effect of vection on both standing and deep squatting with the hypothesis that the squatting posture should not be disturbed by the conflict of sensory information due to vection. The results show that standing posture only was affected by the visual stimuli. The widespread use of squatting for work as well as rest could be due in part to this lack of effect of sensory perturbation on postural stability.
Highlights
It is well-known that vision provides an important source of information for the control of posture
A force plateform constituted of two rigid footpads which dimensions were 36 x 13 cm was used to record the center of pression (CoP) of each participant The resolution of the foot pad is 1.5 g and the accuracy (x-y error) of 0.1 mm, sampling rate, 40 Hz
The data confirm the very significant differences found in previous experiments [4,5,6]: for all participants the classical postural parameters of the displacement of the CoP were significantly smaller when squatting compared with standing
Summary
It is well-known that vision provides an important source of information for the control of posture. On the other hand it has been suggested that deep squatting, a near universal everyday posture, squatting, was not perturbed in no vision condition [4, 5]. These results suggest that vision is not necessary for postural control when squatting. To test this hypothesis, participants were subjected to visual vection. In such a condition the posture is destabilized as the person perceives visually induced self motion even though the body is not moving [6] and should not be disturbed when squatting. Vection induces a conflict of sensory information: visual information specifying movement while somatosensory and vestibular information specify a motionless body
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