Auditory evoked brain potentials as markers of chronic effects of mild traumatic brain injury in mid-life |
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| Affiliation: | 1. Department of Physical Medicine and Rehabilitation, Virginia Commonwealth University, USA;2. Department of Biostatistics, Virginia Commonwealth University, USA;3. Hunter Holmes McGuire VA Medical Center, USA;4. Department of Psychiatry & Behavioral Sciences, University of Minnesota, USA;5. Department of Psychology, University of Minnesota, USA;6. Minneapolis VA Health Care System, USA;7. Departments of Psychiatry and Medical and Clinical Psychology, Uniformed Services University of the Health Sciences, USA |
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| Abstract: | ObjectiveAuditory event-related potential (ERP) correlates of pre-dementia in late-life may also be sensitive to chronic effects of mild traumatic brain injury (mTBI) in mid-life. In addition to mTBI history, other clinical factors may also influence ERP measures of brain function. This study’s objective was to evaluate the relationship between mTBI history, auditory ERP metrics, and common comorbidities.MethodsERPs elicited during an auditory target detection task, psychological symptoms, and hearing sensitivity were collected in 152 combat-exposed veterans and service members, as part of a prospective observational cohort study. Participants, with an average age of 43.6 years, were grouped according to positive (n = 110) or negative (n = 42) mTBI history. Positive histories were subcategorized into repetitive mTBI (3 + ) (n = 40) or non-repetitive (1–2) (n = 70).ResultsPositive history of mTBI was associated with reduced N200 amplitude to targets and novel distractors. In participants with repetitive mTBI compared to non-repetitive and no mTBI, P50 was larger in response to nontargets and N100 was smaller in response to nontargets and targets. Changes in N200 were mediated by depression and anxiety symptoms and hearing loss, with no evidence of a supplementary direct mTBI pathway.ConclusionsAuditory brain function differed between the positive and negative mTBI groups, especially for repetitive injury, which implicated more basic, early auditory processing than did any mTBI exposure. Symptoms of internalizing psychopathology (depression and anxiety) and hearing loss are implicated in mTBI’s diminished brain responses to behaviorally relevant and novel stimuli.SignificanceA mid-life neurologic vulnerability conferred by mTBI, particularly repetitive mTBI, may be detectable using auditory brain potentials, and so auditory ERPs are a target for study of dementia risk in this population. |
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| Keywords: | Mild traumatic brain injury Concussion Chronic traumatic encephalopathy Event-related potentials Auditory processing Military Veteran |
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