title: [Influence of visual attention in visual evoked potential examination].
abstract: OBJECTIVE
  To explore the influence of visual attention in visual evoked potential (VEP) examination.
  
  
  METHODS
  The pattern visual evoked potential (PVEP) and flash visual evoked potential (FVEP) were used to examine 110 normal subjects whose visual acuity or corrected visual acuity is in the range of 4.8-5.2, and age between 20 to 30 years old. In PVEP inspection, subjects were asked to watch with three ways, to stare at the central screen (at the same time count silently the number of alternating of black and white squares to improve the subjects' attention), to stare at the central screen at the same time thinking other things, to look sideways (the left eye stared at the left bottom corner of the screen or the right eye stared at the right one). In FVEP inspection, subjects were checked with eyes open and closed respectively. The latency and amplitude of P100 wave were recorded. The data were statistically analyzed by SPSS 13.0 software. RESULTS In PVEP inspection, the latency and amplitude of P100 wave were statistically different among three watching ways. In FVEP inspection, latency and amplitude of P100 wave were statistically different between eyes open and closed group.
  
  
  CONCLUSIONS
  Although the visual evoked potential test is an objective electrophysiological visual function test, it is susceptible to the influence of various subjective factors such as visual attention. It should arise the attention of forensic experts.
authors.affiliation: Department of Forensic Pathology, Zhongshan Medical College, Sun Yat-sen University, Guangzhou 510080, China.
authors.forename: Wen-Jing
authors.initials: WJ
authors.lastname: Geng
authors.forename: Guang-Yong
authors.initials: GY
authors.lastname: Wang
authors.forename: Chao
authors.initials: C
authors.lastname: Fang
authors.forename: Hua-Lan
authors.initials: HL
authors.lastname: Jing
mesh_terms: D000328:Adult; D001288:Attention; D003299:Cooperative Behavior; D004569:Electroencephalography; D004594:Electrophysiology; D005074:Evoked Potentials, Visual / Q000502:physiology*; D005260:Female; D005554:Forensic Medicine / Q000379:methods; D006801:Humans; D008297:Male; D010364:Pattern Recognition, Visual; D010775:Photic Stimulation; D011930:Reaction Time; D014792:Visual Acuity / Q000502:physiology*; D014794:Visual Fields / Q000502:physiology*; D055815:Young Adult