Spatial perception and vestibulomotor responses in man

Popov, Konstantin; Сметанин, Б. Н.; Gurfinkel, V. S.; Kudinova, M. P.; Shlykov, V. Yu.

doi:10.1007/bf01057795

Cited by 146 publications

(21 citation statements)

References 10 publications

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“…It is considered unlikely that body sway results from a simple cervico-spinal response (Magnus, 1924) since: (i) the subjects showed the same body sway direction when head and trunk were turned together ( Figs 2B and 3), and (ii) it was shown that the direction of body sway is coherent with illusory or hypnotically suggested head orientations rather than with the actual head orientations (Gurfinkel et al 1989(Gurfinkel et al , 1992Smetanin et al 1993). (b) Galvanic stimulation of the vestibular system is normally interpreted as a lateral tilt of the body relative to gravity as sensed by the labyrinthine organs (Popov et al 1986;Fitzpatrick et al 1994;Hlavacka et al 1995;Day et al 1997). The subjects react to the perturbation by tilting the body laterally towards the opposite side.…”

Section: Discussionmentioning

confidence: 99%

Effect of gaze on postural responses to neck proprioceptive and vestibular stimulation in humans

Ivanenko

Grasso

Lacquaniti

1999

The Journal of Physiology

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Section: Discussionmentioning

confidence: 99%

Effect of gaze on postural responses to neck proprioceptive and vestibular stimulation in humans

Ivanenko

Grasso

Lacquaniti

1999

The Journal of Physiology

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“…Supporting this idea, perturbations to a particular sensory organ through experimental manipulations tend to alter the global perception of vertical rather than the more local variables of head orientation in space, or ankle angle, respectively (Lackner et al, 2000, Sorensen et al, 2002, Popov et al, 1986, Tardy-Gervet and Severac-Cauquil, 1998, Park et al, 2006, Bisdorff et al, 1996, Gurfinkel and Levick, 1991, Maurer et al, 2001 , Bosco et al, 1996, Bosco and Poppele, 1997, Lemay and Grill, 2004.…”

Section: Multisensory Integration For Postural Controlmentioning

confidence: 99%

Dimensional reduction in sensorimotor systems: a framework for understanding muscle coordination of posture

Ting

2007

Progress in Brain Research

181

145

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The simple act of standing up is an important and essential motor behavior that most humans and animals achieve with ease. Yet, maintaining standing balance involves complex sensorimotor transformations that must continually integrate a large array of sensory inputs and coordinate multiple motor outputs to muscles throughout the body. Multiple, redundant local sensory signals are integrated to form an estimate of a few global, task-level variables important to postural control, such as body center of mass position and body orientation with respect to Earth-vertical. Evidence suggests that a limited set of muscle synergies, reflecting preferential sets of muscle activation patterns, are used to move task variables such as center of mass position in a predictable direction following a postural perturbations.We propose a hierarchal feedback control system that allows the nervous system the simplicity of performing goal-directed computations in task-variable space, while maintaining the robustness afforded by redundant sensory and motor systems. We predict that modulation of postural actions occurs in task-variable space, and in the associated transformations between the low-dimensional task-space and high-dimensional sensor and muscle spaces. Development of neuromechanical models that reflect these neural transformations between low and high-dimensional representations will reveal the organizational principles and constraints underlying sensorimotor transformations for balance control, and perhaps motor tasks in general. This framework and accompanying computational models could be used to formulate specific hypotheses about how specific sensory inputs and motor outputs are generated and altered following neural injury, sensory loss, or rehabilitation. KeywordsMuscle; balance; EMG; muscle synergy; motor control; biomechanics; feedback; sensorimotor integration Postural control is a fundamental motor task ideally suited for investigating questions of sensorimotor integration and redundancy. The ability to maintain posture and balance are precursors to other voluntary movements such as reaching or walking over uneven terrain. Moreover, loss of balance is a clinically important problem, as falls are a primary cause of injury and accidental death in older adults (Minino et al., 2002 NIH-PA Author ManuscriptNIH-PA Author Manuscript NIH-PA Author Manuscript understanding of the underlying neuromechanical principles that govern patterns of muscle activation during postural control or other basic motor behaviors.Although technological advances allow the simultaneous measurement of multiple kinematic, kinetic, and electromyographic (EMG) data channels during behavioral experiments, we lack a framework for understanding how all of these measured variables are related to the control and performance of a functional task. Without this basic understanding, we cannot begin to understand or predict how patterns of muscle activation should be altered to perform novel tasks, nor can we understand the functional impact of di...

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“…The hypothesis of the informational weight of afferent volleys was discussed in more detail in an earlier publication of our research group [8]. The influence of isolated visual stimuli (VVE shifts) induced rather clear body tilts in the course of separate trials, while the effects of isolated vestibular stimulation on the posture could be detected only after averaging of several trials with synchronization with respect to initiation of stimulation.…”

Section: Discussionmentioning

confidence: 98%

“…In addition, the postural response on electrical stimulation of the labyrinths depends on spatial orientation of the head. As was shown, the direction of such response can change both upon real rotation of the head or creation of an illusion of its rotation [8,9]. Similarly to responses to galvanic stimulation, postural responses to stimulation of proprioceptors (e.g., to vibrational stimulation of the shin or neck muscles) also demonstrate noticeable dependence on the conditions of visual control [10,11].…”

Section: Introductionmentioning

confidence: 88%

Effects of Near-Threshold Stimulation of the Vestibular Apparatus on Postural Responses Evoked by Displacements of the Visualized Surrounding

2012

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In healthy subjects in the relaxed upward stance and perceiving a virtual visual environment (VVE), we recorded postural reactions to isolated visual and vestibular stimulations or their combinations. Lateral displacements of the visualized virtual scene were used as visual stimuli. The vestibular apparatus was stimulated by application of near-threshold galvanic current pulses to the proc. mastoidei of the temporal bones. Isolated VVE shifts evoked mild, nonetheless clear, body tilts readily distinguished in separate trials; at the same time, postural effects of isolated vestibular stimulation could be detected only after averaging of several trials synchronized with respect to the beginning of stimulation. Under conditions of simultaneous combined presentation of visual and vestibular stimuli, the direction of the resulting postural responses always corresponded to the direction of responses induced by VVE shifts. The contribution of an afferent volley from the vestibular organ depended on the coincidence/mismatch of the direction of motor response evoked by such a volley with the direction of response to visual stimulation. When both types of stimulations evoked unidirectional body tilts, postural responses were facilitated, and the resulting effect was greater than that of simple summation of the reactions to isolated actions of the above stimuli. In the case where isolated galvanic stimulation evoked a response opposite with respect to that induced by visual stimulation, the combined action of these stimuli of different modalities evoked postural responses identical in their magnitude, direction, and shape to those evoked by isolated visual stimulation. The above findings allow us to conclude that the effects of visual afferent input on the vertical posture under conditions of our experiments clearly dominate. In general, these results confirm the statement that neuronal structures involved in integrative processing of different afferent volleys preferably select certain type of afferentation carrying more significant or more detailed information on displacements (including oscillations) of the body in space.Keywords: visual and vestibular control, vertical posture, virtual visual environment, galvanic stimulation of the labyrinths, stabilography, domination of afferent inputs.

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Spatial perception and vestibulomotor responses in man

Cited by 146 publications

References 10 publications

Effect of gaze on postural responses to neck proprioceptive and vestibular stimulation in humans

Effect of gaze on postural responses to neck proprioceptive and vestibular stimulation in humans

Dimensional reduction in sensorimotor systems: a framework for understanding muscle coordination of posture

Effects of Near-Threshold Stimulation of the Vestibular Apparatus on Postural Responses Evoked by Displacements of the Visualized Surrounding

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