TY - BOOK AU - Dromerick, Alexander W AU - Libin, Alexander V AU - Lum, Peter S AU - Metzger, Anthony J AU - Milzman, David AU - Terner, Jill TI - Dynamic motor tracking is sensitive to subacute mTBI SN - 0014-4819 PY - 2016/// KW - *Brain Injuries, Traumatic/di [Diagnosis] KW - *Hand Strength/ph [Physiology] KW - *Movement/ph [Physiology] KW - *Nonlinear Dynamics KW - *Visual Perception/ph [Physiology] KW - Adult KW - Case-Control Studies KW - Female KW - Humans KW - Male KW - Middle Aged KW - Muscle Strength Dynamometer KW - Neuropsychological Tests KW - Trauma Severity Indices KW - Young Adult KW - MedStar National Rehabilitation Network KW - MedStar Washington Hospital Center KW - Emergency Medicine KW - Journal Article N2 - Effective screening for mild traumatic brain injury (mTBI) is critical to accurate diagnosis, intervention, and improving outcomes. However, detecting mTBI using conventional clinical techniques is difficult, time intensive, and subject to observer bias. We examine the use of a simple visuomotor tracking task as a screening tool for mTBI. Thirty participants, 16 with clinically diagnosed mTBI (mean time since injury: 36.4 +/- 20.9 days (95 % confidence interval); median = 20 days) were asked to squeeze a hand dynamometer and vary their grip force to match a visual, variable target force for 3 min. We found that controls outperformed individuals with mTBI; participants with mTBI moved with increased variability, as quantified by the standard deviation of the tracking error. We modeled participants' feedback response-how participants changed their grip force in response to errors in position and velocity-and used model parameters to classify mTBI with a sensitivity of 87 % and a specificity of 93 %, higher than several standard clinical scales. Our findings suggest that visuomotor tracking could be an effective supplement to conventional assessment tools to screen for mTBI and track mTBI symptoms during recovery UR - https://dx.doi.org/10.1007/s00221-016-4714-5 ER -