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Eye movements in patients with speech dyspraxia
Acta Oto-Laryngologica
|November 1, 1984
Summary
Patients with speech dyspraxia exhibit oculomotor disturbances, including impaired saccades and smooth pursuit, alongside hyperactive vestibular responses. These findings link frontal eye field lesions to difficulties in initiating and controlling eye movements.
Area of Science:
- Neuroscience
- Ophthalmology
- Speech-Language Pathology
Background:
- Speech dyspraxia is a motor speech disorder.
- Oculomotor control is crucial for various cognitive functions.
- Frontal eye fields play a significant role in eye movement regulation.
Purpose of the Study:
- To quantitatively analyze saccades, smooth pursuit, and vestibular responses in patients with speech dyspraxia.
- To investigate the impact of potential frontal eye field lesions on oculomotor function.
Main Methods:
- Quantitative analysis of saccades, smooth pursuit, and angular acceleration-induced nystagmus.
- Assessment of 10 patients diagnosed with speech dyspraxia.
Main Results:
- Saccades showed reduced accuracy, prolonged reaction time, and decreased peak velocity contralateral to the lesion.
- Smooth pursuit was impaired with reduced maximum velocity gain.
- Vestibular responses were hyperactive, suggesting facilitated brain-stem reflexes.
Conclusions:
- Lesions in the frontal eye field can cause diverse oculomotor disturbances.
- These disturbances affect the triggering, control, and sequencing of eye movements.
- Volitional movement anticipation may be significantly impaired in affected individuals.
