Listening to rhythms activates motor and premotor cortices
Listening to rhythms activates motor and premotor cortices
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DOI：
10.1016/j.cortex.2008.07.002
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发表时间：
2009-01-01
期刊：
影响因子：
3.6
通讯作者：
Sadato, Norihiro
中科院分区：
文献类型：
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作者：
Bengtsson, Sara L.;Ullen, Fredrik;Sadato, Norihiro
我们使用功能磁共振成像(FMRI)来识别与听觉节奏感知有关的大脑区域。参与者听了三个节奏序列，这些节奏序列在时间上的可预测性不同。最可预测的序列是单个间期的等时节律序列(ISO)。另外两个序列有九个持续时间不等的间隔。其中一个具有相对于最短间隔(度量)的整数比率的间隔持续时间。另一组的间隔持续时间与最短间隔(非度量)的比率不是整数，因此在感知上比其他两组更复杂。此外，我们还提出了具有随机分布间隔(RAN)的不可预测序列。我们检验了两个假设。首先，参与运动时序控制的区域也会处理感觉线索的时间可预测性。因此，实验中没有包含能够影响参与者知觉或诱导运动准备的主动任务。我们发现，与随机序列相比，当参与者听节奏序列时，背侧运动前皮质(PMD)、SMA、前SMA和外侧小脑更活跃。辅助运动区(SMA)和前运动区的活动模式表明依赖于序列可预测性的调制，强烈表明在时间感觉预测中的作用。其次，我们假设节律序列越复杂，它越会参与前额叶皮质的短期记忆过程。我们发现，与ISO相比，听节拍和非节拍时，前额叶上皮层更加活跃。我们认为，节奏序列的复杂性是调节许多节奏区域活动的一个重要因素。然而，我们刺激的复杂性的差异应该被认为是连续的。(C)2008年爱思唯尔高级版权所有。
We used functional magnetic resonance imaging (fMRI) to identify brain areas involved in auditory rhythm perception. Participants listened to three rhythm sequences that varied in temporal predictability. The most predictable sequence was an isochronous rhythm sequence of a single interval (ISO). The other two sequences had nine intervals with unequal durations. One of these had interval durations of integer ratios relative to the shortest interval (METRIC). The other had interval durations of non-integer ratios relative to the shortest interval (NON-METRIC), and was thus perceptually more complex than the other two. In addition, we presented unpredictable sequences with randomly distributed intervals (RAN). We tested two hypotheses. Firstly, that areas involved in motor timing control would also process the temporal predictability of sensory cues. Therefore, there was no active task included in the experiment that could influence the participant perception or induce motor preparation. We found that dorsal premotor cortex (PMD), SMA, preSMA, and lateral cerebellum were more active when participants listen to rhythm sequences compared to random sequences. The activity pattern in supplementary motor area (SMA) and preSMA suggested a modulation dependent on sequence predictability, strongly suggesting a role in temporal sensory prediction. Secondly, we hypothesized that the more complex the rhythm sequence, the more it would engage short-term memory processes of the prefrontal cortex. We found that the superior prefrontal cortex was more active when listening to METRIC and NON-METRIC compared to ISO. We argue that the complexity of rhythm sequences is an important factor in modulating activity in many of the rhythm areas. However, the difference in complexity of our stimuli should be regarded as continuous. (C) 2008 Elsevier Srl. All rights reserved.