Precocious Diagnosis for Mild Alzheimer’s Disease with Linear and Nonlinear Features

The initial aim and motivation of this research is planning and providing a system for Diagnosis and identification of Alzheimer patients on light step from the old health individuals. Considering the specifications of EEG1and the way of this sickness with different specifications in brain signal،this sickness may be diagnosed within the primary step through an adequate process. First of all،the brain signal has been registered in four state of : closed eye،opened eye،booster and irritation from three Pz،Cz،Fz channels. Seeing the registered protocol،on the booster period،during 1 minute to the signal registration while the patient remembers the images and during the irritation state and considering the audible sample،the responding manner of subject to the voice of aim are investigated: then،other processes within the frame of time and frequency such as indicating statistical specifications correlation،spectral analysis and deduction of different nonlinear specifications such as lyapanov exponent،correlation dimension and anthropy are done by considering the nonlinear and turbulent nature of the brain signals. Then،by using the variance analysis the optimum specifications were drawn out by using the two classifier LDA2and Elman. According to the drawn out results،it became clear that among the three channels Pz،Cz،Fz and four states of closed eye،opened eye،booster and irritation،the exactitude Pz channel and the state of irritation are more in comparison with the channels and other states. The accuracy of channel Pz result during remembering and irritation period with the selected specifications of the variance analysis through linear selector are respectively 59/4% and 66/4% and in nervous system the exactitude is respectively 92/3% and 94/1%

کلیدواژه ها:

Mild alzheimer’s disease ، EEG ، variance analysis ، LDA ، Elman