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Symptoms elicited in persons with vestibular dysfunction while performing gaze movements in optic flow environments
Susan L Whitney1, Patrick J Sparto, James R Cook
1University of Pittsburgh, Pittsburgh, PA 15260, USA. whitney@pitt.edu
Summary
Individuals with vestibular disorders experience significant discomfort during visual-motor tasks. Their symptoms, including disorientation, were more severe and frequent than in healthy controls, especially during gaze stabilization exercises.
Area of Science:
- Neuroscience
- Ophthalmology
- Vestibular System Research
Background:
- Vestibular disorders frequently cause space and motion discomfort in response to visual stimuli.
- Understanding symptom triggers during head and eye movements is crucial for managing these conditions.
Purpose of the Study:
- To quantify symptom type and severity in individuals with vestibular dysfunction.
- To assess responses during coordinated head/eye movements in optic flow environments.
Main Methods:
- Seven vestibular disorder patients and 25 controls experienced varied optic flow environments.
- Gaze saccade, pursuit, and stabilization tasks were performed, with symptom reporting via SUD and SSQ.
- Dizziness handicap and space/motion discomfort were also measured.
Main Results:
- Vestibular patients reported significantly more discomfort, oculomotor, and disorientation symptoms (55-60% of trials) versus controls (<20%).
- Symptom severity correlated with reported dizziness handicap (Spearman rho > 0.78).
- Vestibular patients exhibited reduced head excursion during gaze saccades.
Conclusions:
- Vestibular dysfunction leads to heightened sensitivity and symptoms in visually dynamic settings.
- Gaze pursuit and stabilization tasks in moving environments exacerbate symptoms in affected individuals.
- Symptom severity is linked to the degree of perceived dizziness handicap.
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