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[Determination of +Gz tolerance end-point by steady state visual evoked potential]
1Institute of Biomedical Engineering, Dept. of Electrical Engineering, Tsinghua University, Beijing, China.
Objective:
To study the possibility of applying steady-state visual evoked potential (SSVEP) to detect the end-point of +Gz tolerance.
Method:
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.
Result:
SSVEP had strong relationship with visual obstruct of the subjects during +Gz exposure.
Conclusion:
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.