Naming Ability in the Chronic Phase of Moderate-Severe Traumatic Brain Injury.

Introduction: Naming difficulties are commonly reported in the acute and subacute stages of recovery of traumatic brain injury (TBI) and across severity levels. Previous studies, however, have used samples of mixed chronicity (acute and chronic) and severity (mild and severe) and then aggregated data across individuals from these distinct groups. Thus, we have little knowledge about the persistence of naming difficulties into the chronic stage of recovery in individuals with moderate-severe TBI.

Purpose: To increase the rigor and reproducibility of naming research in TBI, the present study sought to determine the presence and profile of naming disruptions into the chronic stage of moderate-severe TBI using a confrontation naming assessment.

Method: Thirty-three individuals aged 24-55 years in the chronic epoch of moderate-severe TBI and 33 demographically matched noninjured comparison (NC) participants completed the Philadelphia Naming Test (PNT). A mixed-effects logistic regression model predicting the probability of a correct response as a function of group was fit to the data.

Results: Participants with TBI performed well on the PNT (all participants with TBI had over 90% accuracy). However, participants with TBI were statistically less likely to correctly name an item relative to demographically matched NC participants.

Conclusions: This study provides empirical evidence that naming difficulties persist into the chronic epoch of moderate-severe TBI. Despite high accuracy on the PNT, nearly 60% of these individuals with TBI reported continued difficulty with word finding in their daily lives. This discrepancy leaves open the possibility that, at this stage of injury, word-finding issues may be more reliably evoked and studied when the assessment is embedded within cognitively demanding and ecologically valid contexts (i.e., discourse, conversation). Further investigation of naming deficits in chronic moderate-severe TBI using a more naturalistic assessment is warranted.