Implicit causality bias in adults with traumatic brain injury.

The sample was small, with 19 adults with TBI and 18 uninjured adults, so the result may not apply broadly to people with TBI. All participants were Caucasian and lived in the Midwestern United States, so the findings may not extend to other language and cultural groups. The task used isolated sentences, not conversations or everyday social contexts, so it does not show how often these errors happen in real communication. People with severe dysarthria or aphasia were excluded, so the study says little about clients with more obvious speech or language impairment. The task required some sentence production, verb comprehension, and planning, so it is hard to tell whether reduced bias reflects inference, word finding, or another process. There were no significant correlations between the task and cognitive tests, so the study does not identify the mechanism behind the difference. The TBI group was marginally older and had fewer years of education, although age was not correlated with task scores.

The authors reported no conflicts of interest and said they alone were responsible for the content and writing. The article is tagged as NIH extramural research support.

Do not conclude that trouble with word-level cause inference is a proven cause of everyday communication breakdowns after TBI. The study measured a sentence task in 19 adults with TBI and 18 uninjured adults, and it did not test real conversations, outcomes, or treatment effects.