title: [Determination of +Gz tolerance end-point by steady state visual evoked potential].
abstract: OBJECTIVE
  To study the possibility of applying steady-state visual evoked potential (SSVEP) to detect the end-point of +Gz tolerance.
  
  
  METHODS
  When a subject was exposed to +Gz acceleration on a human centrifuge, the SSVEP signals (evoked by LED lamps triggered by 8 Hz pulse train) were recorded. The characters of SSVEP in frequency domain were extracted by adaptive filtering, and a modified T2circ statistic was used to determine the visual obstruct objectively.
  
  
  RESULTS
  SSVEP had strong relationship with visual obstruct of the subjects during +Gz exposure.
  
  
  CONCLUSIONS
  SSVEP might be used as an objective criterion for determination of end-point of +Gz tolerance and an index of the degree of symptoms as well. But, multi-parameter method seemed still necessary to get reliable estimations.
authors.affiliation: Institute of Biomedical Engineering, Dept. of Electrical Engineering, Tsinghua University, Beijing, China.
authors.forename: L
authors.initials: L
authors.lastname: Zhang
authors.forename: S K
authors.initials: SK
authors.lastname: Gao
authors.forename: Q
authors.initials: Q
authors.lastname: Wu
mesh_terms: D000054:Acceleration; D000337:Aerospace Medicine; D002498:Centrifugation; D003627:Data Interpretation, Statistical; D005074:Evoked Potentials, Visual / Q000502:physiology*; D006801:Humans; D018471:Hypergravity; D010775:Photic Stimulation; D014794:Visual Fields / Q000502:physiology