Biomarkers of memory variability in traumatic brain injury
Abstract
Traumatic brain injury is a leading cause of cognitive disability and is often associated with significant impairment in episodic memory. In traumatic brain injury survivors, as in healthy controls, there is marked variability between individuals in memory ability. Using recordings from indwelling electrodes, we characterized and compared the oscillatory biomarkers of mnemonic variability in two cohorts of epilepsy patients: a group with a history of moderate-to-severe traumatic brain injury (n = 37) and a group of controls without traumatic brain injury (n = 111) closely matched for demographics and electrode coverage. Analysis of these recordings demonstrated that increased high-frequency power and decreased theta power across a broad set of brain regions mark periods of successful memory formation in both groups. As features in a logistic-regression classifier, spectral power biomarkers effectively predicted recall probability, with little difference between traumatic brain injury patients and controls. The two groups also displayed similar patterns of theta-frequency connectivity during successful encoding periods. These biomarkers of successful memory, highly conserved between traumatic brain injury patients and controls, could serve as the basis for novel therapies that target disordered memory across diverse forms of neurological disease.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 15, 2020
- Source ID
- 10.1093/braincomms/fcaa202
Entities
People
- Barbara C. Jobst
- Bradley C Lega
- Ethan A Solomon
- Kan Ding
- Michael J. Kahana
- Paul A. Wanda
- Ramon Diaz-Arrastia
- Richard Adamovich-zeitlin
- Robert E Gross
- Tung Phan
Organizations
- Dartmouth–Hitchcock Medical Center
- Defense Advanced Research Projects Agency
- Emory University
- University of Pennsylvania
- University of Texas Southwestern Medical Center