ABSTRACT
According to the characteristics of the processing data, we precondition the EEG data fi rst. Namely make a relevant analysis between the EOG and other leads, and sort them according to the order from weak to strong. Then carry through the phase space reconstruction. According to the discussion by Brandstater and Swinney [13]: The fl uctuation of partial derivative in scale-free region should be less than 1%. Thus, the scale-free region can be determined. Then the least square method can be used to obtain the correlation dimension. After iterative trials, we found that the correlation dimension can be exactly determined with 12m > . Therefore, in these experiments, we choose 3=τ and 16m = to compute the data of 4 subjects and each contains ten groups separately.
