Modulation of early auditory processing by visually based sound prediction
Modulation of early auditory processing by visually based sound prediction
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DOI：
10.1016/j.brainres.2005.11.017
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发表时间：
2006-01-12
期刊：
影响因子：
2.9
通讯作者：
Takeda, T
中科院分区：
文献类型：
--
作者：
Aoyama, A;Endo, H;Takeda, T
脑磁图（MEG）测量大脑活动，以探讨早期听觉系统是否可以检测到视听模式的变化时，视觉部分是提前呈现。我们假设，一个模板的失配场（MMF）的现象，这通常是由过去的声音预测，也被用于基于视觉的声音预测。类似于MMF的活动可以通过将传入的声音与模板进行比较来引出。刺激是模仿键盘的：一个动画，其中两个键之一被按下，伴随着一个较低或较高的音调。一致的视听对被设计为频繁的，不一致的对被设计为不频繁的。受试者被指示在两组试验（预测条件）中根据键的移动来预测传入的声音，而他们被指示在另外两组（非预测条件）中不这样做。对于每种情况，移动在一组中花费50 ms（Delta = 50 ms），在另一组中花费300 ms（Delta = 300 ms）到达底部，此时发出音调。因此，只有在预测条件下与三角洲= 300毫秒是额外的活动，为不一致的对观察双边在颞上区内的听觉刺激发作的100-200毫秒;这种活动的时空特性类似的MMF。我们的结论是，只有在已经执行了视觉判别和声音预测过程之后，才通过基于视觉的声音预测来创建模板。(c)2005 Elsevier B. V.保留所有权利。
Brain activity was measured by magnetoencephalography (MEG) to investigate whether the early auditory system can detect changes in audio-visual patterns when the visual part is presented earlier. We hypothesized that a template underlying the mismatch field (MMF) phenomenon, which is usually formed by past sound regularities, is also used in visually based sound prediction. Activity similar to the MMF may be elicited by comparing an incoming sound with the template. The stimulus was modeled after a keyboard: an animation in which one of two keys was depressed was accompanied by either a lower or higher tone. Congruent audio-visual pairs were designed to be frequent and incongruent pairs to be infrequent. Subjects were instructed to predict an incoming sound based on key movement in two sets of trials (prediction condition), whereas they were instructed not to do so in the other two sets (non-prediction condition). For each condition, the movement took 50 ms in one set (Delta = 50 ms) and 300 ms in the other (Delta = 300 ms) to reach the bottom, at which time a tone was delivered. As a result, only under the prediction condition with Delta = 300 ms was additional activity for incongruent pairs observed bilaterally in the supratemporal area within 100-200 ms of the auditory stimulus onset; this activity had spatio-temporal properties similar to those of MMF. We concluded that a template is created by the visually based sound prediction only after the visual discriminative and sound prediction processes have already been performed. (c) 2005 Elsevier B.V. All rights reserved.