Traumatic brain injury (TBI) frequently results in memory problems,
and the degree of memory impairment is related to injury severity and is
commonly associated with lesions in frontal and temporal brain areas. This
study examined the relationship among injury severity, brain lesions, and
memory in children with moderate to severe TBI using Donders' (1999) 5-factor model of performance on the California
Verbal Learning Test–Children's Version (CVLT–C).
Seventy-six children underwent magnetic resonance imaging (MRI) scans 3
months post-TBI and testing 1 year post-TBI. Results showed injury
severity (Glasgow Coma Scale) was not predictive of performance on 4 of
the 5 factors. Volume of frontal and/or temporal brain lesions was
significantly predictive of performance on 3 of the 5 factors.
Unexpectedly, lesion volume outside these areas (extra-frontotemporal) was
predictive of performance on all 5 factors. In contrast, Verbal IQ at 1
year was most strongly associated with preinjury factors (socioeconomic
status and special education involvement), although extra-frontotemporal
lesions also contributed to the variability in this measure. Results
suggest that in children with moderate to severe TBI,
extra-frontal/temporal lesions are predictive of memory outcome 1 year
postinjury above and beyond initial severity or frontal/temporal
contusions. This finding may relate to widespread diffuse axonal injury,
which potentially disconnects brain circuits mediating memory following
moderate to severe TBI. (JINS, 2005, 11,
686–696.)