A Study on Chaotic State of EEG Signal

In this paper.the chaotic theory is described briefly and the chaotic state ofEEG on thinking are studied. In this study. the method of detecting short bursts of 40 Hz EEG ac-tivity is firstly usedto dedermine the segments to be computed for analysis of the chaotic state ofEEG. therefore the reliability and stability of the analysis results are assured In this paper.thechaotic para meters of qa n titative analysis are studied and more then 30 subjects EEG are analysedfor the value of the fractional dimension and the maximal Lyapunov exponent.The results of exper-iments indicate that the value of the fractional dimension is valuable for clincal diagnosis and themaximal Lyapunov exponent is not sufficient for dignosis of disease.     

Analysis on 40 Hz ERP During Brain Transient Cognitive Performance

In this investigation 50 normal subjects were observed. Activities of EEG of 8 areas on both hemisphere during six different states were recorded. The author analyzed time ( T ), area( A ) and amplitude ( Amp ) of burst 40 Hz ERP recorded during different states and investigate the correlation's between 40 Hz ERP and age, sex,education background and scores of IQ. The time, area and amplitude of burst 40 Hz ERP are all significantly lower during rest states than those during orientation test, calculation test and visual spatial task test. During thinking process the increase of burst 40 Hz ERP is positive correlated with the scores in MMSE and WAIS. T is the most stable and sensitive marker. A affected by T and Amp, is stable but less sensitive than T. Amp is less sensitive than T and A.     

A Study on the Method of Extraction for 40 Hz EEG Bursts

The bursts of 40HzEEG are a reliable indicator of the " focused arousal ". It hasan active significance in diagnosis of cognitive dysfunction.But, the bursts of 40 Hz EEG are seriously interfered by the high amplitude broad-band EMG signals from the scalp. It causes the difficulty of detection, This paper give a new method uf the combination of threshold extraction in frequency domain and neural network pattern recognition to realize the effective detection of 40 Hz EEGbursts , and reports the mean peak power of the 40 HZ EEG bursts for 11 subjects and analyses theirthinking states, The reaults indicate that the method given in this paper can be used feasibly and support the theory given by D,E, Sheer.     

Two effective methods for the evaluating mental work load on machine-operators — Fractal dimensional analysis with the CGSA method —

In Japanese forestry the mental work loads (MWLs) of machine-operators have become one of significant problems. The RR intervals of two harvester-operators were measured in selective thinning operations. Fractal and harmonic components were separated from the spectra of the RR intervals with the Coarse-graining spectral analysis (CGSA) method. As all fractal dimensions concentrated around 1.5, these lower levels were considered that the operators suffered large MWLs from the thinning operations. The power of the 0.10 Hz spectral component of harmonic components reduced definitively in thinning operations, it became evident that thinning operations were stressful work for harvester-operators. As a result of this research, those two methods were proven to be more effective in estimating the MWLs of harvester-operators.     

The Application of the Theory of 40 Hz EEG in the Stady of Chaotic States of EEG Signals

In this paper,the theory of 40 Hz EEG bursts is firstly used to judge whether thesubjects cooperate with us or not,and to determine the segments which can be processed for the studyof chaotic states of EEG signals.The theory,the realization of detecting method and the practiceapplication of 40 Hz EEG bursts are studied.     

300Hz矩形波连续音对真鲷音响驯化的实验研究

作为一种资源管理型的渔业方式,音响驯化型海洋牧场的开发是新世纪海洋渔业发展的主要内容之一,但对海水鱼类进行驯化时采用何种频率和波形声音的研究积累尚少。在实验室条件下,用300Hz矩形波连续音对真鲷（Chrysophrys major）进行音响驯化实验,结果表明,真鲷的反应时间逐日缩短并接近对照组,平均反应时间为15．1s,其中第5天、第6天、第10天的反应时间与对照组差异不显著（P〉0．05）;聚集时间逐日减少并从第7天开始低于对照组,平均聚集时间为41.3s,其中第10～15天的聚集时间与对照组有极显著差异（P〈0．01）;聚集率则逐日增加并从第3天开始超过对照组,平均聚集率为87．6％,其中第4天、第10-15天的聚集率与对照组有极显著差异（P〈0．01）。由此可见,300Hz矩形波连续音对真鲷具有明显的驯化作用。     

利用500Hz方波连续音驯化南海真鲷幼鱼的效果

在实验室条件下采用500 Hz方波连续音对体长范围为4.4～6.6 cm的南海真鲷（Chrysophrys major）幼鱼连续进行8 d音响驯化研究,试验数据利用Origin软件的Gaussion模型分析。结果显示,对照组试验鱼在水池中随机分布,试验组试验鱼在驯化第1天至第8天出现频次最大的区域分别距离水池中心点105.40 cm、93.51 cm、88.04 cm、83.40 cm、71.86 cm、83.06 cm、83.23 cm和96.85 cm。试验组反应时间从第5天起缩短趋势已无明显变化,一直处于最短状态,驯化第2天开始低于对照组;聚集时间第4天起缩短趋势变化不明显,一直处于最短状态,驯化全过程低于对照组;停留时间第5天起增加趋势变化不明显,均处于最长时间,驯化全过程高于对照组;聚集率在第4天起达到最佳,驯化全过程高于对照组。由此可见,500 Hz方波连续音对真鲷幼鱼具有良好的驯化效果,并且在驯化5 d后即可建立良好的条件反射。