The Study On P300-based Detection Of Lie

According to precious documents, we are sure that as a concept or behavior, lying can be found not only in today’s social, but also in the ancient world. The third wave in the field of Children’s Cognitive Development, research on“Theory of Mind”greatly promotes the research level and definition about lying or deception. Despite being forbidden by almost all societies, lying is everywhere in our daily life and makes a strong impact on human sociality. There is no agreement whether the impact is positive or negative, but all kinds of culture and ethnic human groups have developed many methods to detect lies or deception. In the twenty years from the 19th century to the 20th century,based on the medicine machine Polygraph, Psychophysiological Detection of Deception (PDD) came out. Because of standardization and objectivity, PDD has been widely applied in the forensic field now. At the same time, it brings up all kinds of complicated problems dealing with scientific、social、legal and ethical aspects, especially legal problems. The new techniques, fMRI (functional magnetic resonance imaging) and ERP (event-related potential) from Cognitive Neuroscience make it possible to resolve those problems. Based on the modified mock crime scenario, the study practices a series of ERP laboratory experiments. The major findings of the study include the following: there is a gap between mock crime scenario and real crime situation; significance effect is the theoretical foundation of lie detection; P300-based detection of lie in target paradigms is feasible; P300-based detection of lie is an effective counter-countermeasure measure.