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Vestibular perceptual thresholds to angular rotation in acute unilateral vestibular paresis and with galvanic stimulation
Author(s) -
Cutfield Nicholas J.,
Cousins Sian,
Seemungal Barry M.,
Gresty Michael A.,
Bronstein Adolfo M.
Publication year - 2011
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.2011.06159.x
Subject(s) - vestibular system , audiology , galvanic vestibular stimulation , stimulus (psychology) , angular acceleration , nystagmus , semicircular canal , vestibulo–ocular reflex , stimulation , caloric theory , physics , psychology , medicine , neuroscience , angular velocity , quantum mechanics , psychotherapist
Studies of compensation of injury to the human vestibular system have, in the main, focused on the vestibular‐ocular reflex. Probing vestibular perception allows more of the sensory pathway to be assessed. We present a novel paradigm for simultaneously testing vestibular perceptual and nystagmic thresholds to angular acceleration around an earth vertical axis. The perceptual thresholds can be modulated asymmetrically in normal subjects by DC galvanic stimulation with the head flexed in the roll plane, as expected from the main torsional plane of action of the galvanic stimulus. The perceptual and nystagmic thresholds were bilaterally elevated in acute vestibular neuritis, a unilateral condition, possibly due to central suppression of vestibular input. The degree of asymmetry in thresholds was small in comparison with the large caloric asymmetry present in the patients, indicating a relatively preserved capacity for near‐threshold performance of the non‐damaged labyrinth both in the “on” and “off” directions.