EEG lie detection method based on lyapunov exponent and correlation dimension
A correlative dimension and EEG technology, applied in diagnostic recording/measurement, medical science, psychological devices, etc., can solve problems such as non-linear and chaotic characteristics of EEG signals, information loss, etc.
Active Publication Date: 2018-06-12
SHAANXI NORMAL UNIV
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However, although the above processing method improves the signal-to-noise ratio of the evoked EEG signal under a single response, and intuitively reflects the difference between honest and deceitful behaviors, it does not take into account the nonlinear and chaotic characteristics of the EEG signal, resulting in partial information loss
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[0096] Such as figure 2 Shown a kind of EEG polygraph method based on Lyapunov exponent and correlation dimension, comprises the following steps:
[0097] Step 1, EEG polygraph judgment threshold setting: use the parameter setting unit 2 connected to the processor 1 to set the EEG polygraph judgment threshold of the EEG signal extraction device 8, see figure 1 ;
[0098] The EEG signal extraction device 8 includes a Pz electrode, and the Pz electrode is an EEG electrode arranged at the apex of the subject's head according to the international standard "10 / 20" electrode placement method;
[0099] The EEG polygraph judgment threshold of the EEG signal extraction device 8 includes the EEG polygraph judgment threshold of the Pz electrode, and the EEG polygraph judgment threshold of the Pz electrode includes the Lyapunov index judgment threshold L Pz and associated dimension judgment threshold D Pz , where L Pz and D Pz are constants, L Pz = 0.0015 ~ 0.0165, D Pz =0.6125~0....
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The invention discloses an electroencephalographic lie detection method on the basis of Lyapunov indexes and correlation dimensions.The electroencephalographic lie detection method includes steps of firstly, setting electroencephalographic lie detection judging thresholds of electroencephalographic signal extraction devices by the aid of parameter setting units; secondly, acquiring electroencephalographic signals, to be more specific, extracting the electroencephalographic signals from the vertexes of the heads of tested persons by the aid of Pz electrodes in real time, synchronously acquiring the electroencephalographic signals by the aid of electroencephalographic signal acquisition equipment according to preset sampling frequencies and synchronously transmitting the acquired electroencephalographic signals to processors; thirdly, analyzing and processing the electroencephalographic signals, to be more specific, receiving and synchronously storing the electroencephalographic signals, extracting features of the electroencephalographic signals, judging whether the tested persons lie or not and outputting lie judging results.The electroencephalographic signal extraction devices comprise the Pt electrodes.The electroencephalographic signals which are acquired at the second step are extracted by the aid of the Pz electrodes.The electroencephalographic lie detection method has the advantages that the electroencephalographic lie detection method includes the simple steps and is reasonable in design and convenient to implement, good service effects can be realized, and lying states can be easily, quickly and accurately detected by the aid of the electroencephalographic lie detection method.
Description
technical field [0001] The invention belongs to the technical field of electroencephalogram signal processing, in particular to an electroencephalogram lie detection method based on Lyapunov exponent and correlation dimension. Background technique [0002] Polygraph technology, as an auxiliary means of judicial interrogation, plays an important role in the investigation and proof of the facts of criminal cases, and has been widely used. How to identify lies accurately and effectively is particularly important for the staff of the judiciary, and it is of great practical significance to study the detection methods of lies. In 1912, the multi-conductor polygraph developed in the United States mainly used physiological changes such as respiration, pulse, blood pressure, and skin voltage to distinguish lies. Since the above parameters are easily affected by subjective factors, it is difficult to ensure the accuracy of the test results, false positives and The false negative rate...
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IPC IPC(8): A61B5/16A61B5/0484
CPCA61B5/164A61B5/7203A61B5/7271A61B2503/00A61B5/316A61B5/377
Inventor 艾玲梅陈慧君
Owner SHAANXI NORMAL UNIV