Temporal integration in auditory sensory memory: Neuromagnetic evidence
Temporal integration in auditory sensory memory: Neuromagnetic evidence
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DOI：
10.1016/0168-5597(95)00271-5
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发表时间：
1996-05-01
期刊：
影响因子：
--
通讯作者：
Hari, R
中科院分区：
文献类型：
--
作者：
Loveless, N;Levanen, S;Hari, R
通过对脑磁诱发反应的分析，探讨听觉感觉记忆的皮层机制。听觉诱发野的主要偏转(N100m)包括对时间因素敏感的早期后部成分(N100m(P))和晚期前部成分(N100m(A))，当两个相同的声音间隔小于250ms时，第二个声音诱发的N100m(A)的潜伏期约为150ms，幅度增大，我们认为N100m(A)可能反映听觉感觉记忆中两个不同过程的活动。它的恢复周期可能反映了记忆痕迹的活动，根据之前的研究，记忆痕迹可以将有关听觉序列的处理信息保留约10秒。增强效应可以反映时间积分过程的活动，其时间常数使得感觉在刺激抵消后持续200-300毫秒，并因此用作短暂记忆存储。落在这个积分窗口内的声音序列似乎被整体编码为么正事件。
The cortical mechanisms of auditory sensory memory were investigated by analysis of neuromagnetic evoked responses. The major deflection of the auditory evoked field (N100m) appears to comprise an early posterior component (N100m(P)) and a late anterior component (N100m(A)) which is sensitive to temporal factors; When pairs of identical sounds are presented at intervals less than about 250 msec, the second sound evokes N100m(A) with enhanced amplitude at a latency of about 150 msec, We suggest that N100m(A) may index the activity of two distinct processes in auditory sensory memory. Its recovery cycle may reflect the activity of a memory trace which, according to previous studies, can retain processed information about an auditory sequence for about 10 sec. The enhancement effect may reflect the activity of a temporal integration process, whose time constant is such that sensation persists for 200-300 msec after stimulus offset, and so serves as-a-short memory store. Sound sequences falling within this window of integration seem to be coded holistically as unitary events.