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lüll Longitudinal changes in linguistic complexity among professional football players Berisha V; Wang S; LaCross A; Liss J; Garcia-Filion PBrain Lang 2017[Jun]; 169 (ä): 57-63Reductions in spoken language complexity have been associated with the onset of various neurological disorders. The objective of this study is to analyze whether similar trends are found in professional football players who are at risk for chronic traumatic encephalopathy. We compare changes in linguistic complexity (as indexed by the type-to-token ratio and lexical density) measured from the interview transcripts of players in the National Football League (NFL) to those measured from interview transcripts of coaches and/or front-office NFL executives who have never played professional football. A multilevel mixed model analysis reveals that exposure to the high-impact sport (vs no exposure) was associated with an overall decline in language complexity scores over time. This trend persists even after controlling for age as a potential confound. The results set the stage for a prospective study to test the hypothesis that language complexity decline is a harbinger of chronic traumatic encephalopathy.|*Linguistics[MESH]|Adult[MESH]|Chronic Traumatic Encephalopathy/*psychology[MESH]|Football/*injuries/psychology[MESH]|Humans[MESH]|Longitudinal Studies[MESH]|Male[MESH]|Young Adult[MESH] |