Trejo L J, Ryan-Jones D L, Kramer A F
Department of Psychology, University of Illinois at Urbana-Champaign 61820, USA.
Psychophysiology. 1995 Jul;32(4):319-28. doi: 10.1111/j.1469-8986.1995.tb01214.x.
We examined the attentional sensitivity of the frequency-change mismatch negativity (MMN). Subjects listened to a binaural mixture of a narrative and a series of tone bursts that included 1200-Hz standards and two deviants (1000 and 1400 Hz). In the attend-tones condition, subjects responded to one deviant and ignored the narrative. In the attend-words condition, subjects responded to target words in the narrative and ignored the tones. Event-related potentials (ERPs) were recorded for the tones, and difference waves (deviant ERPs minus standard ERPs) were computed. Two negative peaks in the difference waves, DN1 (100-180 ms) and DN2 (200-300ms), overlapped the known scalp distribution and latency of the MMN. Mean DN1 and DN2 amplitudes were greater in the attend-tones condition than in the attend-words condition. These suggest that the frequency-change MMN is modulated by nonspatial shifts of auditory attention.
我们研究了频率变化失配负波（MMN）的注意敏感性。受试者聆听了一段叙述与一系列短音脉冲的双耳混合声音，其中包括1200赫兹的标准音以及两个偏差音（1000赫兹和1400赫兹）。在注意短音条件下，受试者对一个偏差音做出反应并忽略叙述内容。在注意单词条件下，受试者对叙述中的目标单词做出反应并忽略短音。记录短音的事件相关电位（ERP），并计算差异波（偏差ERP减去标准ERP）。差异波中的两个负峰，DN1（100 - 180毫秒）和DN2（200 - 300毫秒），与已知的MMN头皮分布和潜伏期重叠。注意短音条件下的平均DN1和DN2波幅大于注意单词条件下的。这些结果表明，频率变化MMN受听觉注意的非空间转移调节。
