1997 年 16 巻 1 号 p. 33-37
The deteriorative effects of hypobaric hypoxia on psychological processing in humans were studied using Questionnaire for High Altitude Symptoms, group judgement test, rote memorization test, Kyoto University Intelligence Test, and cognitive performance task undervarious simulated high altitudes. Most subjects exhibited a syndrome similar to "mountain sickness" during rapid ascent and indicated abrupt impairement of psychological activities at an altitude of 5,000m. Furthermore, the effects of hypobaric hypoxia on cognitive processing were investigated by recording event-related brain potentials (ERPSs) in an odd-ball reaction time (RT) paradigm. Most subjects demonstrared abrupt impairment of RT at high altitudes. RTs lengthened in association with changes in latency and amplitude of the N2-P3 components, reflecting stimulus discrimination and evaluation processes. Slow waves following the P3 component were associated with attempts to maintain RTs against the deteriorative effects of hypobaric hypoxia.