title: Cognitive Impairment in Essential Tremor without Dementia.
abstract: OBJECTIVE
  Several clinical studies have demonstrated that patients with essential tremor (ET) may have cognitive deficits; however, there are no published data regarding detailed neuropsychological assessments of ET without dementia. We therefore conducted a case-control study of cognitive function in patients with ET.
  
  
  METHODS
  The cohort for this study comprised 34 consecutive patients with ET without dementia and 33 age-matched controls, all of who completed a dementia-screening questionnaire and underwent a detailed neuropsychological investigation.
  
  
  RESULTS
  Severe impairments were observed in most domains for the ET group compared to the controls, including attention, part of language function, verbal memory, and frontal executive functions.
  
  
  CONCLUSIONS
  Our results support the finding that the subclinical cognitive deficits characterized by attention, verbal memory impairments, and executive dysfunction are a clinical feature of ET. In addition, our results also support the finding that age at examination and educational status are the most important risk factors associated with cognitive deficits in patients with ET.
authors: Department of Neurology, College of Medicine, The Catholic University of Korea, Seoul, Korea.
authors: Joong-Seok
authors: JS
authors: Kim
authors: In-Uk
authors: IU
authors: Song
authors: Yong-Soo
authors: YS
authors: Shim
authors: Jeong-Wook
authors: JW
authors: Park
authors: Ji-Yeon
authors: JY
authors: Yoo
authors: Yeong-In
authors: YI
authors: Kim
authors: Kwang-Soo
authors: KS
authors: Lee