稳态视觉诱发电位在+Gz耐力终点判断中的应用

Determination of +Gz Tolerance End-point by Steady State Visual Evoked Potential

目的旨在研究用稳态视觉诱发电位检测飞行员在高加速度情况下耐力终点的可能性。方法在离心机施加加速度的情况下记录被试者的稳态视觉诱发电位。用自适应滤波估计方法提取稳态视觉诱发电位中特定的频率成分 ,然后再进行T2 circ统计检验 ,从中发现耐力终点判断的客观指标。结果稳态视觉诱发电位信号特征与高加速度情况下飞行员视觉功能障碍有明显的相关性。结论稳态视觉诱发电位不仅有可能被用于人体加速度耐力终点的判断 ,而且有可能作为评定视觉功能障碍程度的指标之一 ;单一指标的判断方法是不够的 ,寻找多指标综合评定的方法非常必要。

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 T 2 circ 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.