Synchronizing with auditory and visual rhythms: An fMRI assessment of modality differences and modality appropriateness
Synchronizing with auditory and visual rhythms: An fMRI assessment of modality differences and modality appropriateness
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DOI：
10.1016/j.neuroimage.2012.11.032
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发表时间：
2013-02-15
期刊：
影响因子：
5.7
通讯作者：
Keller, Peter E.
中科院分区：
文献类型：
--
作者：
Hove, Michael J.;Fairhurst, Merle T.;Keller, Peter E.
与视觉闪光相比，与听觉节拍同步的运动可以在与时间相关的大脑区域中产生不同的激活以及更稳定的敲击同步。与时间相关的大脑激活的差异可能反映了敲击同步稳定性的差异，而不是模态之间的差异（即音频运动与视觉运动整合）。在当前的功能磁共振成像研究中，参与者将手指敲击与四种类型的视觉和听觉节奏序列同步：闪光和移动条，以及蜂鸣声和调频“警报器”。行为敲击结果表明，随着目标移动，视觉运动同步性得到改善，而调频警报器则使音频运动同步性降低。因此，在离散的蜂鸣声和闪烁之间发生了同步的模态差异，但在新颖的连续警报器和移动条之间则没有。成像结果显示，壳核（关键计时区域）的激活与行为结果平行：蜂鸣声时壳核的激活最高，连续警笛和移动条的壳核激活最高，闪烁时的壳核激活最低。壳核激活在蜂鸣声和闪烁模式之间存在差异，但对于新颖的移动条和警报器则没有差异。通过将同步性能与模态分离，我们表明基底神经节的激活与该任务中的感觉运动同步稳定性相关，而不是与模态特异性相关。同步稳定性显然取决于模态的处理亲和力：离散的听觉和移动视觉信号是模态合适的，并且可以可靠地编码以与运动系统集成。 (c) 2012 Elsevier Inc. 保留所有权利。
Synchronizing movements with auditory beats, compared to visual flashes, yields divergent activation in timing-related brain areas as well as more stable tapping synchronization. The differences in timing-related brain activation could reflect differences in tapping synchronization stability, rather than differences between modality (i.e., audio-motor vs. visuo-motor integration). In the current fMRI study, participants synchronized their finger taps with four types of visual and auditory pacing sequences: flashes and a moving bar, as well as beeps and a frequency-modulated 'siren'. Behavioral tapping results showed that visuo-motor synchronization improved with moving targets, whereas audio-motor synchronization degraded with frequency-modulated sirens. Consequently, a modality difference in synchronization occurred between the discrete beeps and flashes, but not between the novel continuous siren and moving bar. Imaging results showed that activation in the putamen, a key timing area, paralleled the behavioral results: putamen activation was highest for beeps, intermediate for the continuous siren and moving bar, and was lowest for the flashes. Putamen activation differed between modalities for beeps and flashes, but not for the novel moving bar and siren. By dissociating synchronization performance from modality, we show that activation in the basal ganglia is associated with sensorimotor synchronization stability rather than modality-specificity in this task. Synchronization stability is apparently contingent upon the modality's processing affinity: discrete auditory and moving visual signals are modality appropriate, and can be encoded reliably for integration with the motor system. (c) 2012 Elsevier Inc. All rights reserved.