Pfister Roland, Foerster Anna, Kunde Wilfried
a Department of Psychology III , Julius-Maximilians University of Würzburg , Würzburg , Germany.
Soc Neurosci. 2014;9(6):562-72. doi: 10.1080/17470919.2014.934392. Epub 2014 Jun 27.
Even though electroencephalography has played a prominent role for lie detection via personally relevant information, the electrophysiological signature of active lying is still elusive. We addressed this signature with two experiments in which participants helped a virtual police officer to locate a knife. Crucially, before this response, they announced whether they would lie or tell the truth about the knife's location. This design allowed us to study the signature of lie-telling in the absence of rare and personally significant oddball stimuli that are typically used for lie detection via electrophysiological markers, especially the P300 component. Our results indicate that active lying attenuated P300 amplitudes as well as N200 amplitudes for such non-oddball stimuli. These results support accounts that stress the high cognitive demand of lie-telling, including the need to suppress the truthful response and to generate a lie.
尽管脑电图在通过个人相关信息进行测谎方面发挥了重要作用，但主动说谎的电生理特征仍然难以捉摸。我们通过两个实验来探究这一特征，在实验中参与者帮助一名虚拟警察找到一把刀。关键的是，在做出这个反应之前，他们要宣布自己会就刀的位置说谎还是说实话。这种设计使我们能够在没有通常用于通过电生理标记（特别是P300成分）进行测谎的罕见且与个人相关的异常刺激的情况下，研究说谎的特征。我们的结果表明，对于此类非异常刺激，主动说谎会减弱P300波幅以及N200波幅。这些结果支持了强调说谎具有高认知需求的观点，包括抑制真实反应和编造谎言的必要性。
