Similarities and differences among the P3 waves to detected signals in three modalities.
Similarities and differences among the P3 waves to detected signals in three modalities.
复制标题
P3 波与三种模式中检测到的信号之间的异同。
作者：
Elaine Snyder;S. Hillyard;R. Galamboš
事件相关脑电位记录从头皮，而受试者检测到视觉，听觉和体感刺激呈现阈值附近。波形的特点是大，晚阳性（P3）波信号检测在所有三种模式。这些P3的头皮分布显示三种方式之间没有实质性差异。然而，有可靠的潜伏期和振幅的差异，与P3视觉信号发生晚于躯体（研究1）或听觉（研究2）信号。此外，检测到的视觉信号的P3明显大于听觉或体感信号。两者合计，数据表明，P3波的所有形式产生一个共同的神经生成系统，但视觉信号访问这个系统在不同的方式从其他方式。
Event-related brain potentials were recorded from the scalp while subjects detected visual, auditory, and somatosensory stimuli presented near threshold. The waveforms were characterized by large, late-positive (P3) waves to signal detections in all three modalities. The scalp distributions of these P3s revealed no substantial differences among the three modalities. There were, however, reliable latency and amplitude differences, with the P3 to visual signals occurring later than to somatic (Study 1) or to auditory (Study 2) signals. Further, the P3s to detected visual signals were substantially larger than those to auditory or somatosensory signals. Taken together, the data suggest that P3 waves to all modalities arise from a common neural generating system but that visual signals access this system in a different fashion from the other modalities.