Covington J W, Polich J
Department of Psychology, University of California, San Diego, La Jolla 92093, USA.
Electroencephalogr Clin Neurophysiol. 1996 Nov;100(6):579-84. doi: 10.1016/s0168-5597(96)96013-x.
Auditory and visual stimulus intensity levels were manipulated systematically in separate conditions to assess the influence of these variables on the P300 event-related brain potential (ERP). Increases in stimulus intensity produced increases in P300 amplitude and decreases in peak latency for both modalities, although the latency effects were stronger for visual stimulation. Similar, somewhat weaker stimulus intensity effects also were observed for the N100, P200, and N200 components. The findings suggest that stimulus intensity contributes to both P300 amplitude and latency measures in important ways and are discussed in relation to the use of ERPs in applied contexts.
在不同条件下系统地操纵听觉和视觉刺激强度水平，以评估这些变量对P300事件相关脑电位（ERP）的影响。刺激强度的增加导致两种模式下P300波幅增加和峰值潜伏期缩短，尽管视觉刺激的潜伏期效应更强。在N100、P200和N200成分中也观察到类似但稍弱的刺激强度效应。研究结果表明，刺激强度在重要方面对P300波幅和潜伏期测量都有影响，并结合ERP在应用环境中的使用进行了讨论。
