N400 evoked potential lie detection method based on sample entropy

A technology of evoked potential and sample entropy, which is applied in the field of cognitive neuroscience, can solve the problems of unsatisfactory and stable detection of lies, the inability to rule out the influence of small probability stimuli, and the inability to effectively reflect EEG signals, so as to ensure the accuracy of recognition , Fast detection speed, convenient effect

CN105249963BActive Publication Date: 2018-02-13SHAANXI NORMAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-02-13

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Abstract

The invention provides a N400 evoked potential lie detection method based on sample entropy, comprising the following steps: EEG signal extraction and synchronous amplification; EEG signal acquisition; EEG signal reception and synchronous storage; EEG signal preprocessing; EEG signal Superposition average; EEG signal sample entropy feature value extraction; lying or not state judgment, combined with sample entropy to measure the complexity of N400-induced EEG signals, reflecting its nonlinear characteristics, and finding the characteristics that distinguish lying or not through statistical analysis of data The threshold value compares the absolute value of the entropy value difference between the probe stimulus and the irrelevant stimulus ERP EEG signal data sample with the size of the threshold value, and judges whether to lie. The invention has the advantage of effectively ensuring a stable lie recognition accuracy rate.
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Description

Technical field

[0001] The present invention belongs to the combined application of the field of cognitive neuroscience and the field of information technology, and relates to a polygraph method for event-related potential N400, specifically a polygraph method for N400 evoked potential based on sample entropy. Background technique

[0002] As a psychological phenomenon, lying does not only appear in today's society. It can be seen from the historical archives that we currently know that lying occurred in the early days of human society. Although many lies are well-intentioned, there are also many lies that endanger national security, social security, fairness and justice. For example, in espionage crimes, duty crimes, and criminal investigations, criminals deliberately lie in order to conceal crimes and evade legal sanctions. During the trial of a case, lies will have a huge impact on the trial of the case and the determination of crime. Therefore, how to accurately and effecti...

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Embodiment Construction

[0050] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0051] Attached below figure 1 A detailed description of the invention type:

[0052] Step 1: Extraction and synchronous amplification of EEG signals: The EEG signals of 64 parts of the subject’s head are extracted in real time through 64-lead EEG electrode 1, and the 64-lead brain is extracted through EEG signal amplifier 2 The 64-channel EEG signals extracted by the electric electrode 1 are amplified simultaneously; before the EEG signal...