论文部分内容阅读
目的研究经不同感觉通道输入信息时脑认知能力的差异，观察急性缺氧时经不同感觉通道输入信息时脑认知能力的改变。方法１０名受试者在地面和４３００ｍ模拟高度（吸入低氧混合气）分别进行视觉、听觉和视－听（视觉和听觉刺激同时呈现）Ｏｄｄｂａｌ任务测试，记录脑电图（ＥＥＧ）和反应时（ＲＴ），ＥＥＧ经叠加平均处理提取出脑事件相关电位（ＥＲＰ），并测量其Ｐ３波的潜时和波幅。以Ｐ３潜时和ＲＴ为主要指标评定脑认知能力。采用两因素析因设计及统计学处理。结果不同感觉通道间比较，视觉通道的Ｐ３潜时和ＲＴ均长于听觉和视－听通道，ＲＴ以视－听通道最快。急性缺氧对视觉通道和听觉通道均可明显减慢其Ｐ３潜时和ＲＴ。结论对听觉刺激的脑认知反应速度较视觉为快，而用视听联合刺激可加快反应速度。缺氧会减慢脑信息加工过程，听觉刺激的认知反应和视觉一样对缺氧敏感。
Objective To study the difference of cognitive ability of the brain when the information is input through different sensory channels and to observe the change of cognitive ability of the brain when information is input through different sensory channels during acute hypoxia. Methods Ten subjects underwent visual, auditory and visual-auditory (visual and auditory stimuli) Oddbal tasks on the ground and 4300 m mimics (inhaled hypoxia) respectively. EEG and response (RT). EEG was processed by stacking and averaging to extract ERP and measure the potential and amplitude of P3 wave. P3 cognitive latency and RT as the main indicators of brain cognitive ability. Using two factors factorial design and statistical processing. Results Compared with different sensory channels, P3 latency and RT of visual channels were longer than those of auditory and visual-auditory channels, with visual acuity of RT - the fastest of auditory channels. Acute hypoxia can significantly slow down its P3 latency and RT for both visual and auditory channels. Conclusions Brain auditory response to auditory stimulation is faster than that of visual perception, whereas combined hearing and hearing stimulation can speed up the response. Hypoxia slows the process of brain information processing, and cognitive responses to auditory stimuli are as sensitive to hypoxia as vision.