Preattentive memory-based comparison of sound intensity
Preattentive memory-based comparison of sound intensity
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DOI：
10.1159/000073518
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发表时间：
2003-11-01
影响因子：
1.6
通讯作者：
Schröger, E
中科院分区：
文献类型：
--
作者：
Jacobsen, T;Horenkamp, T;Schröger, E
重复的、被忽略的声音的强度的变化引起失配负波（MMN）脑反应，其反映了对变化的前注意检测。一般认为，MMN在响应强度变化反映了一个基于记忆的比较机制，而不是由于不同的状态强度特异性皮层神经元的不应性。在本研究中，一个实验方案，包括4个oddball块和1个控制块，以分离记忆比较相关的影响，从不应性相关的，这种设计允许的强度MMN的评估使用物理上相同的刺激具有相同的概率发生在不同的块，同时避免污染的不应性。结果是一致的MMN的强度变化，反映了真正的记忆为基础的比较。版权所有（C）2003 S. Karger AG，巴塞尔。
Changes in the intensity of repeated, ignored sounds elicit the mismatch negativity (MMN) brain response which reflects preattentive detection of the change. It is generally assumed that the MMN in response to intensity changes reflects a memory-based comparison mechanism rather than being due to differential states of refractoriness of intensity-specific cortical neurons. In the present study, an experimental protocol consisting of 4 oddball blocks and 1 control block was used in order to separate memory-comparison-related effects from refractoriness-related ones, This design allowed an assessment of intensity MMN using physically identical stimuli with equal probability of occurrence in separate blocks, while avoiding contamination by refractoriness. Results were consistent with an MMN in response to intensity change that reflects genuine memory-based comparison. Copyright (C) 2003 S. Karger AG, Basel.