Human standing is modified by an unconscious integration of congruent sensory and motor signals

Luu, Billy L, Inglis, J. Timothy, Huryn, Thomas P., Van der Loos, H. F. Machiel, Croft, Elizabeth A. and Blouin, Jean-Sebastien (2012) Human standing is modified by an unconscious integration of congruent sensory and motor signals. The Journal of physiology, 590 22: 5783-5794. doi:10.1113/jphysiol.2012.230334

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Author Luu, Billy L
Inglis, J. Timothy
Huryn, Thomas P.
Van der Loos, H. F. Machiel
Croft, Elizabeth A.
Blouin, Jean-Sebastien
Title Human standing is modified by an unconscious integration of congruent sensory and motor signals
Journal name The Journal of physiology   Check publisher's open access policy
ISSN 0022-3751
Publication date 2012-11
Year available 2012
Sub-type Article (original research)
DOI 10.1113/jphysiol.2012.230334
Open Access Status
Volume 590
Issue 22
Start page 5783
End page 5794
Total pages 12
Place of publication Chichester, West Sussex, United Kingdom
Publisher Wiley-Blackwell Publishing
Collection year 2012
Language eng
Formatted abstract
We investigate whether the muscle response evoked by an electrically induced vestibular perturbation during standing is related to congruent sensory and motor signals. A robotic platform that simulated the mechanics of a standing person was used to manipulate the relationship between the action of the calf muscles and the movement of the body. Subjects braced on top of the platform with the ankles sway referenced to its motion were required to balance its simulated body-like load by modulating ankle plantar-flexor torque. Here, afferent signals of body motion were congruent with the motor command to the calf muscles to balance the body. Stochastic vestibular stimulation (±4 mA, 0–25 Hz) applied during this task evoked a biphasic response in both soleus muscles that was similar to the response observed during standing for all subjects. When the body was rotated through the same motion experienced during the balancing task, a small muscle response was observed in only the right soleus and in only half of the subjects. However, the timing and shape of this response did not resemble the vestibular-evoked response obtained during standing. When the balancing task was interspersed with periods of computer-controlled platform rotations that emulated the balancing motion so that subjects thought that they were constantly balancing the platform, coherence between the input vestibular stimulus and soleus electromyogram activity decreased significantly (P < 0.05) during the period when plantar-flexor activity did not affect the motion of the body. The decrease in coherence occurred at 175 ms after the transition to computer-controlled motion, which subjects did not detect until after 2247 ms (Confidence Interval 1801, 2693), and then only half of the time. Our results indicate that the response to an electrically induced vestibular perturbation is organised in the absence of conscious perception when sensory feedback is congruent with the underlying motor behaviour.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Human Movement and Nutrition Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 16 times in Thomson Reuters Web of Science Article | Citations
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Created: Tue, 02 Dec 2014, 10:27:56 EST by Sandrine Ducrot on behalf of School of Human Movement and Nutrition Sciences