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Normative Ranges for Oculomotor and Reaction Time Tests in U.S. Military Service Members and Veterans.

Daniel S Talian¹, Megan M Eitel¹, Danielle J Zion¹

¹Audiology and Speech Pathology Center, Walter Reed National Military Medical Center, Bethesda, Maryland.

Journal of the American Academy of Audiology

|December 12, 2024

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This study establishes reference intervals for oculomotor and reaction time tests in service members and veterans, providing crucial normative data for neurological assessments and traumatic brain injury evaluations.

Area of Science:

Neuroscience
Clinical Psychology
Rehabilitation Medicine

Background:

Oculomotor and reaction time tests are vital for assessing neurological conditions like traumatic brain injury (TBI).
Existing normative data for these tests are limited, particularly for military populations and according to established standards.
Establishing reliable reference intervals (RIs) is crucial for accurate clinical and research interpretation.

Purpose of the Study:

To describe reference intervals (RIs) for oculomotor and reaction time tests in a cohort of service members and veterans (SMVs).
To provide clinicians and scientists with normative data for comparison in similar populations.
To address the gap in military-specific normative data for these neurological assessments.

Main Methods:

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A descriptive study design was employed.

Participants were prospectively enrolled in a longitudinal TBI study; only SMVs without prior TBI or blast exposure were included for RI calculations.

Nonparametric methods, adhering to FDA standards, were used to calculate 95% RIs for 13 oculomotor and reaction time tests, including smooth pursuit, saccades, and reaction time paradigms.

Main Results:

Summary statistics and 95% RIs were calculated for 47 outcome parameters across 13 tests.
Sample sizes for RI calculations ranged from 51 to 69, with participants aged 19 to 61 years.
The RIs generated in this study tended to be wider than those from previous research, highlighting the importance of population-specific data.

Conclusions:

The provided reference intervals offer valuable comparative data for clinicians and researchers using these oculomotor and reaction time tests.
These RIs are applicable to similar cohorts of patients and research participants, particularly within military and veteran populations.
This study contributes essential normative data for the interpretation of neurological assessments in SMVs.