COMPLEXITY OF EEG IN DIFFERENT FUNCTIONAL STATES
不同状态下脑电图复杂性探索

A measure of complexity defined by Lemple and Ziv (1976) represents the rate of new patterns generating in a given string when it's length grows,it is also a measure to describe a string in what degree to close to randomness. The reason why we apply this measure to EEG analyses is that it can oveimme some vital problna of the cochtion dion as a measure of the EEG.In this paper,we esthatal the complexity of the EEG under 8 differen experiInental conditions, induding seeing,hearing,taking act and doing arithmetic calCUtation, whichrepsome basic brain functional stabs.D&ta from 16 electrode sites and 13 male subjects are reported.The resultS show the complexity measure varies with scalp scalp sites and conditions.According to the statistics,the complexity meastire is higher When eye opened than closed,and lower when taking tasks than being free at the active scalp siams mainly localal in frontal area.It should also be stressed that the complexity measme wiht provide a new way to extlact borotant infonnation for cognhve process of human blain.