Saarinen J, Paavilainen P, Schöger E, Tervaniemi M, Näätänen R
University of Helsinki, Department of Psychology, Finland.
Neuroreport. 1992 Dec;3(12):1149-51. doi: 10.1097/00001756-199212000-00030.
Representations of abstract attributes of auditory stimuli in the human brain were demonstrated using the mismatch negativity (MMN), an event-related potential component elicited by a change in a repetitive sound. Stimuli were pairs of sinusoidal tones. There were two types of tone pairs in each block, standard (p = 85%) and deviant pairs (p = 15%), delivered in a random order. Standard and deviant tone pairs differed only in the direction of within-pair frequency change. In addition, the frequency levels of both the standard and deviant pairs varied randomly within a wide range in a block; thus the standard pairs shared the direction of the within-pair frequency change but not the absolute frequency level. Correspondingly, the deviant pairs only shared the opposite direction of the within-pair change. Nevertheless, the deviant tone pairs elicited MMN, implying that even the direction of the within-pair frequency change of the standard stimuli, and not just their absolute frequencies, developed a neural representation.
使用失匹配负波（MMN）证明了人类大脑中听觉刺激抽象属性的表征，MMN是由重复声音的变化引发的一种事件相关电位成分。刺激是正弦波音调对。每个组块中有两种类型的音调对，标准对（p = 85%）和偏差对（p = 15%），以随机顺序呈现。标准和偏差音调对仅在对内频率变化方向上有所不同。此外，标准对和偏差对的频率水平在一个组块内的很宽范围内随机变化；因此，标准对共享对内频率变化的方向，但不共享绝对频率水平。相应地，偏差对仅共享对内变化的相反方向。然而，偏差音调对引发了MMN，这意味着即使是标准刺激的对内频率变化方向，而不仅仅是它们的绝对频率，也形成了一种神经表征。
