Spectral power, source localization and microstates to quantify chronic deficits from 'mild' closed head injury: correlation with classic neuropsychological tests.
OBJECTIVE
To explore the quantitative relationship between neuropsychological impairment and spectral QEEG power, source localization (s-LORETA) and microstate duration in patients who 'fail to adapt' years after mild closed head injury.


METHODS
Differences in classic psychometric measures, QEEG measures, s-LORETA indicators and microstate durations were compared for three levels of neuropsychological impairment ∼(average) 6 years after injury.


RESULTS
Patients who displayed the moderate-to-severe neuropsychological impairments typical of mild TBIs exhibited shorter microstates, less power within the alpha band and lower power within the theta and delta bands within caudal regions. There were conspicuous differences in the configurations of microstates, their source localizations and frequency bands.


CONCLUSIONS
The systematic relationship between neuropsychological impairment as inferred by classic psychometric measures that can require tens of hours to collect and modern configurational analyses of brain activity that require ∼30 minutes suggests that the latter might be useful in discerning the area of dysfunction and potential focus of treatment for patients with closed head injury years after the event.
Department of Psychology, Behavioural Neuroscience Program, Biomolecular Sciences Program, Laurentian University , Sudbury, Ontario , Canada.
Paula L
PL
Corradini
Michael A
MA
Persinger
D000328:Adult; D020208:Brain Injury, Chronic / Q000175:diagnosis / Q000473:pathology* / Q000523:psychology; D001931:Brain Mapping; D004569:Electroencephalography; D005260:Female; D016489:Head Injuries, Closed / Q000150:complications / Q000473:pathology* / Q000523:psychology; D006801:Humans; D008297:Male; D009483:Neuropsychological Tests; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D013997:Time Factors
Microstate durations; neuropsychological test batteries; quantitative electroencephalogram; source localization (s-LORETA); traumatic brain injury