Rapid number naming in chronic concussion: eye movements in the King-Devick test

Autor:	John Ross Rizzo, Ivan Selesnick, Joel Birkemeier, Laura J. Balcer, Todd E. Hudson, Janet C. Rucker, Rosa M. Pasculli, Steven L. Galetta, Weiwei Dai
Rok vydání:	2016
Předmět:	medicine.medical_specialty business.industry General Neuroscience Eye movement Sequela Mean age 030229 sport sciences Audiology medicine.disease Test (assessment) 03 medical and health sciences 0302 clinical medicine Visual function Peak velocity Concussion Saccade medicine Neurology (clinical) business 030217 neurology & neurosurgery Research Articles Research Article
Zdroj:	Annals of Clinical and Translational Neurology
ISSN:	2328-9503
Popis:	Objective The King–Devick (KD) test, which is based on rapid number naming speed, is a performance measure that adds vision and eye movement assessments to sideline concussion testing. We performed a laboratory-based study to characterize ocular motor behavior during the KD test in a patient cohort with chronic concussion to identify features associated with prolonged KD reading times. Methods Twenty-five patients with a concussion history (mean age: 31) were compared to control participants with no concussion history (n = 42, mean age: 32). Participants performed a computerized KD test under infrared-based video-oculography. Results Average intersaccadic intervals for task-specific saccades were significantly longer among concussed patients compared to controls (324.4 ± 85.6 msec vs. 286.1 ± 49.7 msec, P = 0.027). Digitized KD reading times were prolonged in concussed participants versus controls (53.43 ± 14.04 sec vs. 43.80 ± 8.55 sec, P = 0.004) and were highly correlated with intersaccadic intervals. Concussion was also associated with a greater number of saccades during number reading and larger average deviations of saccade endpoint distances from the centers of the to-be-read numbers (1.22 ± 0.29° vs. 0.98 ± 0.27°, P = 0.002). There were no differences in saccade peak velocity, duration, or amplitude. Interpretation Prolonged intersaccadic intervals, greater numbers of saccades, and larger deviations of saccade endpoints underlie prolonged KD reading times in chronic concussion. The KD test relies upon a diffuse neurocognitive network that mediates the fine control of efferent visual function. One sequela of chronic concussion may be disruption of this system, which may produce deficits in spatial target selection and planning of eye movements.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::15527418364cc8ea30a7ae3a0543914e https://pubmed.ncbi.nlm.nih.gov/27752515 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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