睡眠过渡过程的外-内相互作用关联维数分析

Correlation dimension of external-inner interaction in sleep transition process

目的:探讨外-内相互作用下,认知任务与有害认知相互作用过程,并对比分析失眠者和正常人之间的相互作用过程差异。方法:实验于2005-10在中南民族大学脑认知实验室进行。选取华中师范大学和中南民族大学中在校大学生19人,其中睡眠良好者12人,失眠者7人。采用Tung实验模式,要求被试者在入睡过程中对目标刺激和非目标刺激进行鉴别反应,记录其睡眠过渡过程中的行为反应量。实验刺激物是由计算机控制的响度相近、频率不同的两种短音。两种声音中,一个是目标声,另一个为非目标声。结果:19人均进入结果分析。①失眠者的睡眠潜伏期均在30min以上。②获得睡眠过渡过程的归一化反应时间序列。对被试者的归一化反应时间序列进行相空间重构,分形结果显示:正常人存在三四个稳定的线性无标度区,失眠者存在1个稳定的线性无标度区。③影响正常被试者和失眠者睡眠过渡过程的独立变量并不相同,失眠者较多,一般大于6个,而正常被试者的较少,一般为两三个,少数存在4～6个的情况。结论:在过渡过程中,认知任务和有害认知相互作用,在无标度区内处于相对稳定。对于失眠者和正常人,稳定相互作用的区间数目及影响过渡过程的独立作用因素个数也并不相同。而每个无标度区都对应着一个脑资源占用状态,这就表明,正常人存在三四个脑资源占用不同的相互作用的稳定状态。而失眠者则只存在着一个相对稳定的相互作用稳定的状态。

AIM： Applying the external-inner interaction to detect the interaction process of the cognitive task and intrusive thoughts and find the interaction difference of insomnia and the normal. METHODS： The experiment was conducted at Brain Cognitive Science Laboratory, Central South University for Nationalities in October 2005, nineteen students of seven insomnia and twelve normal students in the Central South University for Nationalities and Central China Normal University were tested by using the Tung＇ pattern, in which there were two different stimulates of frequency controlled b,, computer and the identical loudness, consisting of one target stimulate and one non-target stimulate. In this task, the subjects were asked to detect the target from two different sound stimulates during sleep onset and the behavioral response magnitude was recorded. RESULTS： All 19 subjects were involved in the result analysis.①The sleep latency of insomnia subjects was all over 30 minutes. ②The normal subject had 3-4 stable non-scale range of reconstructed phase space normalization based on normalized response time series. But the insomnia had only one.③There were different independent variables of sleep transition process between the normal and insomnia, and more in the latter （≥6） while the normal had 2-3, even 4-6 in minority. CONCLUSION： The interaction of the task and intrusive thoughts is steady in non-scale range. It is different that the number of range and independent component has effect on the sleep transition between the normal and the insomnia. Actually each non-scale range corresponding to brain state, which occupy brain resource, suggests that the normal has 3-4 stable brain states and insomnia has one.