Social cognition four years after mild-TBI: An age-matched prospective longitudinal cohort study.

To assess longer-term social cognition after mild traumatic brain injury (mTBI) and to identify the sociodemographic and acute factors (mood, cognitive functioning, and symptoms) influencing social cognition. Data were extracted for 121 adults who experienced a mTBI and completed the Emotion Evaluation and Social Inference Enriched tests of The Awareness of Social Inference Test (TASIT) 4 years postinjury. To identify early indicators of outcome, responses to the Hospital Anxiety and Depression Scale, Rivermead Post-Concussion Symptom Questionnaire, and CNS Vital Signs neurocognitive assessment conducted 1 month postinjury were also extracted. Social cognition scores were compared to age-matched TASIT norms (N = 121). The mTBI group was significantly less able to interpret what people say and intend than norms, although the effect sizes were small (d = 0.43). There were 24.8% of people 4 years postmTBI and 9.9% of norms who experienced at least mild impairment in social inference. There were no significant differences between the mTBI group and norms for emotion evaluation. Poorer social inference 4 years after mTBI was significantly associated with lower cognitive flexibility and executive function (F = 2.57, df = 13,26, p = .02). Group differences remained after controlling for cognitive functioning (F = 104.59 df = 1,58, p = .001. These novel results suggest that adults postmTBI may experience social inference difficulties 4 years post-TBI that are not completely explained by cognitive difficulties. Further research is needed. (PsycINFO Database Record (c) 2019 APA, all rights reserved).