Yabe H, Tervaniemi M, Sinkkonen J, Huotilainen M, Ilmoniemi R J, Näätänen R
Department of Psychology, University of Helsinki, Finland.
Psychophysiology. 1998 Sep;35(5):615-9. doi: 10.1017/s0048577298000183.
A deviation in the acoustic environment activates an automatic change-detection system based on a memory mechanism that builds a neural trace representing the preceding sounds. The present study revealed that the auditory-cortex mechanisms underlying this sensory memory integrate acoustic events over time, producing a perception of a unitary auditory event. We recorded magnetic responses (MMNm) to occasional stimulus omissions in trains of stimuli presented at a constant stimulus-onset asynchrony (SOA) that was, in different blocks, either shorter or longer in duration than the assumed length of the temporal window of integration. A definite MMNm was elicited by stimulus omission only with the three shortest SOAs used: 100, 125, and 150 ms, but not with 175 ms. Thus, 160-170 ms was estimated as the length of the temporal window used by the central auditory system in integrating successive auditory input into auditory event percepts.
声学环境中的偏差会激活一个基于记忆机制的自动变化检测系统，该记忆机制会构建一个代表先前声音的神经痕迹。本研究表明，这种感觉记忆背后的听觉皮层机制会随着时间整合声学事件，从而产生对单一听觉事件的感知。我们记录了在以恒定刺激起始异步（SOA）呈现的刺激序列中偶尔出现刺激遗漏时的磁反应（MMNm），在不同的组块中，该SOA的持续时间比假定的整合时间窗口长度短或长。仅在使用的三个最短SOA（100、125和150毫秒）时，刺激遗漏会引发明确的MMNm，而175毫秒时则不会。因此，估计160 - 170毫秒是中枢听觉系统将连续听觉输入整合为听觉事件感知时所使用的时间窗口长度。
