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ERP,尤其是P300测谎已经取得了迅速的发展,并在很多研究中达到较高的鉴别准确率,但是目前还没有研究考察说谎相关的P300效应是否会受到动机准备的影响。本研究通过一个指示性说谎的范式考察了动机准备对说谎和诚实反应相关的P300的影响。行为结果表明,动机准备条件的反应更快,旧词反应比新词快,诚实反应快于说谎反应。ERP结果发现,在动机同步条件下,P300波幅表现出了欺骗效应和新旧效应,其潜伏期对欺骗效应不敏感,而在动机准备条件下,P300波幅只能反映新旧效应而不能反映说谎效应,但是,Cz和Fz点的P300的潜伏期可能能区分说谎和诚实反应。
ERP, especially the P300 polygraph, has been rapidly developed and has achieved high accuracy in many studies. However, no study has examined whether the P300 effect related to lying can be affected by motivation preparation. The present study examines the impact of motivation preparation on the P300 associated with lying and honest responses, using an instructive lying paradigm. Behavioral results show that motivation to prepare more responsive conditions, the old word response faster than the new word, honest response faster than lying reaction. ERP results showed that under the condition of motivation synchronization, the amplitude of P300 showed deceptive effect and old-new effect, and its latency was not sensitive to the deceptive effect. Under the condition of motivation preparation, the amplitude of P300 only reflected the old and new effects but did not reflect the lie effect. However, The P300 latency at Cz and Fz points may be able to distinguish between lying and honest responses.