Objective To study the characteristics of EEG after tramsient ischemic attack and to offer reference for screening procedure of aircrew and astronaut selection. Method The dominant frequency uncertainty of alpha band EEG in 12 pilots(males; age 30±5) with transient ischemic episodes in middle cerebral artery(MCA) territories and in 20 normal healthy pilots was analyzed with frequency-fluctuation analysis. Result The dominant probability of the main frequency coinciding with sites affected by transient ischaemic attack(TIA) in patient pilots was higher than that in healthy pilots (P<0.01),and the dominant probability ratio logarithmic index I≥0 in all patient pilots with normal EEG, but I<0 in all healthy pilots. It was also found that not only I≥0, but the second component shifted to lower frequency(8 Hz) in patients with slight focal EEG alterations,i.e. slowing of frequency. The relative entropy values (percentage) were decreased significantly in pilots with TIA as compared with healthy pilots (P＜0.05). Conclusion The dominant frequency uncertainty analysis of alpha band showed clear superiority of computerized evaluation over routine visual assessment for the diagnosis of minor cerebral ischemia. It offers not only a possibility of studying pathophysiological functional parameter, but also the reference for screening procedure in aircrew and astronaut selection.

A set of computer-based psychological state measuring and assessing application system is developed for Chinese astronauts. The system that comprises two computers simulates multiple spaceflight precautionary tasks and measures a series of psychological and physiological indexes, including spontaneous and evoked encephalpotential, of the objects under different psychological stimulation conditions. It can be applied to researching the variation and assessment method of personnel's work performance, physiological and psychological states under different stress conditions, workload level and stimulus given through acoustical, optical and haptical channels, and finding new psychological and ergnomical methods and indexes to assess work performance. It can also be used to promote individual workload endurability and work performance.