For solving the unvariability of subject cognitive states under the same kind of stimulus in the conventional machine learning methods
the method based on P300 and machine learning was proposed. The standard three-stimuli protocol was chosen. Thirty guilty and innocent subjects were randomly divided into two groups and their EEG signals were first recoded. Independent component analysis(ICA)was carried out to decompose the datasets in the probe stimuli. The ICs with the largest projection strength at Pz were selected to reconstruct the Pz waveforms. Then small number of Pz waveforms within each subject is further averaged. Afterwards
the time-domain and wavelet features were extracted from each denoised Pz waveforms. In terms of the classifier to identify the P300 and non-P300 waveforms
the individual diagnostic rate was evaluated. The experimental results show that the SVM classifier is suitable to identify the sense states of lying
and the proposed method enables to improve the SNR in single trails
enhancing the accuracy of identifying the P300 and of individual diagnostic rate.
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references
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