[Determination of +Gz tolerance end-point by steady state visual evoked potential].
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.
Zhang
L
L
Institute of Biomedical Engineering, Dept. of Electrical Engineering, Tsinghua University, Beijing, China.
Gao
S K
SK
Wu
Q
Q
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