Azizian Allen, Freitas Antonio L, Parvaz Mohammad A, Squires Nancy K
Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, California, USA.
Psychophysiology. 2006 May;43(3):253-60. doi: 10.1111/j.1469-8986.2006.00409.x.
Event-related potentials were used to investigate neural processes relating perceptual similarity to action control. To assess whether perceptual overlap among targets and nontargets would modulate the N2/P3 complex, the present study used multiple nontarget categories varying in their targetlike characteristics. Participants made one (relatively rare) response to a low-probability stimulus (target), and they made a different (relatively common) response to all other stimuli (nontargets). The critical nontarget categories had equivalent probability (.10) but varied in their targetlike characteristics. Supporting the N2 component as sensitive to the strength of conflicting action imperatives, perceptual overlap among targets and nontargets elicited a prominent N2. In contrast, amplitude of the P3 component appeared most sensitive to the extent of cognitive processing needed for categorization.
事件相关电位被用于研究与动作控制相关的知觉相似性的神经过程。为了评估目标与非目标之间的知觉重叠是否会调节N2/P3复合波，本研究使用了多个在类目标特征上有所不同的非目标类别。参与者对低概率刺激（目标）做出一种（相对罕见）反应，而对所有其他刺激（非目标）做出不同的（相对常见）反应。关键的非目标类别具有相同的概率（0.10），但其类目标特征有所不同。支持N2成分对冲突动作指令强度敏感的观点，目标与非目标之间的知觉重叠引发了显著的N2波。相比之下，P3成分的波幅似乎对分类所需的认知加工程度最为敏感。
