Frontoparietal Priority Maps as Biomarkers for MTBI

University of Minnesota88 enrolled

Overview

The purpose of this study is to determine whether there is a quantitative relationship between brain processes seen by a MRI and visual deficits caused by mild to moderate traumatic brain injuries (mTBI).

Participants with mTBI, as well as healthy control participants, will be invited to participate in up to two study visits. Both visits will occur at the University of Minnesota's Center for Magnetic Resonance Research (CMRR). The first study visit will entail (1) interviews to determine the presence of (and, if present, the severity of) oculomotor difficulties such as convergence insufficiency, and (2) behavioral measures (e.g., visually track a moving dot) to assess skill at allocating spatial attention. For participants who have not before participated in an MRI study at the CMRR, a 15-minute scan to acquire research-quality anatomical images of the brain will be acquired at the end of the first visit. A subset of the approximately 88 participants who participate in Visit 1 will be invited to participate in Visit 2. Visit 2 will be dominated by a 90-minute scanning session in the 7 Tesla scanner, during which participants will perform a 10-minute spatial attention task and a 10-minute eye movement task, and high-resolution diffusion tensor imaging data will be acquired while participants enjoy the movie of their choice in the scanner.

Study Type

OBSERVATIONAL

Enrollment

Conditions

TBI (Traumatic Brain Injury)Ocular Motility Disorders

Eligibility

Sex: ALLMin age: 18 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * Normal or corrected to normal visual acuity * No previously documented mTBI (target: 16 out of 88 participants invited for Visit 1) * Previously documented mTBI (target: 72 out of 88 participants invited for Visit 1) * Vision impairment (target: 48 out of 88 participants invited for Visit 1; expected to be comorbid with mTBI, but non-TBI participants with oculomotor impairments will not be excluded) Exclusion Criteria: * Current use of neuroactive drugs or medications * Presence of neurological disorders (other than mTBI and mild PTSD) * Contraindications for MRI (metal in the body, claustrophobia, diabetes or other diseases or drugs that affect thermoregulation) * Inability to comply with behavioral task instructions

Outcomes

Primary Outcomes

oculomotor performance

Oculomotor performance will be measured with behavioral questionnaires, eye-charts, and computerized eye-tracking while subjects perform saccades and smooth pursuit motions.

Time frame: study enrollment / baseline

Secondary Outcomes

frontoparietal priority maps

Functional MRI data will be collected at 7 Tesla while subjects perform spatial attention and eye movement tasks.

Time frame: baseline

white matter integrity

Diffusion tensor imaging data will be acquired at 7 Tesla and analyzed in a priori regions of interest adjacent to frontal and parietal functional regions of interest.

Time frame: baseline

Data from ClinicalTrials.gov

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