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• W2149697629 endingPage "2088" @default.
• W2149697629 startingPage "2081" @default.
• W2149697629 abstract "In order to investigate the ways in which sensory channels interact to control balance, we measured the postural response evoked by galvanic vestibular stimulation (GVS) in a rare subject (I. W.) with a large‐fibre sensory neuronopathy. I. W. has no sensations of cutaneous light touch and movement/position sense below the neck, and without vision he has no knowledge of where his limbs and body are in space. He was tested with and without vision while seated. With eyes closed, I. W.’s responses to pure vestibular stimuli were an order of magnitude larger than those of healthy controls. In other respects his responses were normal. Part of this phenomenon may have been due to lack of response modification by somatosensory feedback. However, the initial development of his ground reaction force, which is the earliest mechanical indicator of the response, differed from that of a control subject from its beginning. Similarly, opening his eyes resulted in a reduction (>50%) of the response from its beginning. We propose that these early changes reflect changes in initial response selection, possibly by alterations in the gain of vestibulopostural channels. We suggest that similar gain changes operate in healthy subjects and occur through a fast dynamic process. A model is put forward in which the weight of each sensory channel is adjusted continuously in a competitive manner according to the balance‐relevant information content of the other sensory channels. As a secondary issue, the nature of I. W.’s head and trunk tilt response provides insight into the question of which vestibular afferents are recruited by GVS. I. W.’s responses consisted of an initial, relatively fast tilt followed by a slower, continuous tilt. When the stimulus was turned off, his body partially tilted back at an intermediate velocity. We modelled this behaviour as the algebraic sum of a position response and a constant velocity response. We suggest that these two components arise from stimulation of otolith and semicircular canal afferents, respectively." @default.
• W2149697629 created "2016-06-24" @default.
• W2149697629 creator A5086075559 @default.
• W2149697629 date "2002-09-01" @default.
• W2149697629 modified "2023-10-18" @default.
• W2149697629 title "Vestibular-evoked postural responses in the absence of somatosensory information" @default.
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• W2149697629 doi "https://doi.org/10.1093/brain/awf212" @default.
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