The use of profanity during letter fluency tasks in frontotemporal dementia and Alzheimer disease.

Objective: To assess whether the production of profanity during letter fluency testing distinguishes frontotemporal dementia (FTD) and Alzheimer disease (AD) patients.

Background: Alterations in language and social behavior typify FTD spectrum disorders. Nonetheless, in can be difficult to distinguish pathologically defined frontotemporal lobar degeneration (FTLD) from AD clinically.