Sussman E, Ritter W, Vaughan H G
Department of Neuroscience, Albert Einstein College of Medicine, Bronx, NY 10461, USA.
Brain Res. 1998 Apr 6;789(1):130-8. doi: 10.1016/s0006-8993(97)01443-1.
The mismatch negativity (MMN), a component of event-related potentials (ERP), was used to investigate the effect of attention on auditory stream segregation. Subjects were presented with sequences of alternating high and low tones that occurred at a constant rate, which they ignored. When subjects ignored the stimuli, the three-tone standard and deviant sequences contained within the high- and low-pitched tones did not emerge and no MMNs were obtained. Subjects were then instructed to attend to the high-pitched tones of the stimulus sequences and detect the within-stream deviants. When subjects selectively attended the high-pitched tones, MMNs were obtained to the deviants within both the attended and unattended streams. These results indicate that attention can produce segregation such that the sequences of low- and high-pitched tones are available to the automatic deviance detection system that underlies the generation of the MMN. Selective attention can alter the organization of sensory input in the early stages of acoustic processing.
失匹配负波（MMN）是事件相关电位（ERP）的一个成分，被用于研究注意力对听觉流分离的影响。向受试者呈现以恒定速率交替出现的高音和低音序列，让他们忽略这些序列。当受试者忽略刺激时，高音和低音中包含的三音标准序列和偏差序列并未出现，也未获得MMN。然后指示受试者关注刺激序列中的高音，并检测流内偏差。当受试者选择性地关注高音时，在被关注流和未被关注流中的偏差都获得了MMN。这些结果表明，注意力可以产生分离，使得高音和低音序列能够被自动偏差检测系统所利用，该系统是产生MMN的基础。选择性注意力可以在声学处理的早期阶段改变感觉输入的组织。
