• John-Ross Rizzo, Todd E Hudson, Weiwei Dai, Ninad Desai, Arash Yousefi, Dhaval Palsana, Ivan Selesnick, Laura J Balcer, Steven L Galetta, and Janet C Rucker.
• Department of Physical Medicine & Rehabilitation, NYU School of Medicine, New York, NY, United States; Department of Neurology, NYU School of Medicine, New York, NY, United States.
• J. Neurol. Sci. 2016 Mar 15; 362: 232-9.

ObjectiveConcussion is a major public health problem and considerable efforts are focused on sideline-based diagnostic testing to guide return-to-play decision-making and clinical care. The King-Devick (K-D) test, a sensitive sideline performance measure for concussion detection, reveals slowed reading times in acutely concussed subjects, as compared to healthy controls; however, the normal behavior of eye movements during the task and deficits underlying the slowing have not been defined.MethodsTwelve healthy control subjects underwent quantitative eye tracking during digitized K-D testing.ResultsThe total K-D reading time was 51.24 (±9.7) seconds. A total of 145 saccades (±15) per subject were generated, with average peak velocity 299.5°/s and average amplitude 8.2°. The average inter-saccadic interval was 248.4 ms. Task-specific horizontal and oblique saccades per subject numbered, respectively, 102 (±10) and 17 (±4). Subjects with the fewest saccades tended to blink more, resulting in a larger amount of missing data; whereas, subjects with the most saccades tended to make extra saccades during line transitions.ConclusionsEstablishment of normal and objective ocular motor behavior during the K-D test is a critical first step towards defining the range of deficits underlying abnormal testing in concussion. Further, it sets the groundwork for exploration of K-D correlations with cognitive dysfunction and saccadic paradigms that may reflect specific neuroanatomic deficits in the concussed brain.Copyright © 2016 Elsevier B.V. All rights reserved.

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