Verbal fluency, clustering, and switching in patients with psychosis following traumatic brain injury (PFTBI)

Abstract

Verbal fluency in patients with psychosis following traumatic brain injury (PFTBI) has been reported as comparable to healthy participants. This finding is counterintuitive given the prominent fluency impairments demonstrated post-traumatic brain injury (TBI) and in psychotic disorders, e.g. schizophrenia. We investigated phonemic (executive) fluency (3 letters: 'F' 'A' and 'S'), and semantic fluency (1 category: fruits and/or vegetables) in four matched groups; PFTBI (. N=10), TBI (. N=10), schizophrenia (. N=23), and healthy controls (. N=23). Words produced (minus perseverations and errors), and clustering and switching scores were compared for the two fluency types across the groups. The..