title: Validity and reliability of cognitive assessment using virtual environment technology in patients with stroke.
abstract: OBJECTIVE
  We assessed the validity and reliability of a virtual environment technology (VET)-based cognitive assessment program that was developed as a measurement tool of cognitive abilities in patients after a stroke.
  
  
  METHODS
  Twenty participants diagnosed with stroke caused by unilateral brain lesions were enrolled to assess the VET program's validity and test-retest reliability. Participants underwent evaluation by paper-based neuropsychological tests including the Korean Mini-Mental Status Examination, the Korean-Wechsler Adult Intelligence Scale, the Motor Free Visual Perception Test, Rey-Kim Memory Test, and Kim's Frontal-Executive Neuropsychologic Test as well as the VET-based cognitive assessment. Major variables and indices of the VET program were calculated. The VET program validity was evaluated using a simple correlation analysis between variables from the VET program and conventional paper-based neuropsychological measurements, and the reliability was evaluated by investigating the test-retest correlation coefficients.
  
  
  RESULTS
  Major variables and indices of the VET program in patients with stroke correlated significantly with the related scores of paper-based neuropsychological tests. In addition, the test-retest reliability analysis revealed that the correlation coefficients ranged from 0.528 to 0.926.
  
  
  CONCLUSIONS
  The VET-based cognitive assessment program showed adequate reliability and validity as a method of cognitive assessment in patients after stroke.
authors.affiliation: Department of Biomedical Engineering, The Graduate School, Yonsei University, Seoul, Korea.
authors.forename: Jeonghun
authors.initials: J
authors.lastname: Ku
authors.forename: Jang Han
authors.initials: JH
authors.lastname: Lee
authors.forename: Kiwan
authors.initials: K
authors.lastname: Han
authors.forename: Sun I
authors.initials: SI
authors.lastname: Kim
authors.forename: Youn Joo
authors.initials: YJ
authors.lastname: Kang
authors.forename: Eun Sook
authors.initials: ES
authors.lastname: Park
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000368:Aged; D003072:Cognition Disorders / Q000175:diagnosis* / Q000209:etiology; D004185:Disability Evaluation; D006801:Humans; D008875:Middle Aged; D009483:Neuropsychological Tests; D020521:Stroke / Q000150:complications; D014584:User-Computer Interface