Functional specialization within the supplementary motor area: a fNIRS study of bimanual coordination.
Functional specialization within the supplementary motor area: a fNIRS study of bimanual coordination.
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DOI：
10.1016/j.neuroimage.2013.04.112
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发表时间：
2014-01-15
期刊：
影响因子：
5.7
通讯作者：
Arpin, David J.
中科院分区：
文献类型：
--
作者：
Wilson, Tony W.;Kurz, Max J.;Arpin, David J.
可以通过协调地弯曲和伸展目标效应器(例如，手部肌肉)来执行双手运动，或者通过使一侧的单元与相对侧的相同单元的伸展一致地弯曲单元来执行。前一种运动模式通常被称为同相或平行，而后一种模式通常被称为反相运动。众所周知，反相模式是不稳定的，往往会在较高的重复频率下自发地过渡到同相运动，但其机制和涉及的大脑区域尚未完全了解。在目前的研究中，我们利用功能近红外光谱(FNIRS)来评估辅助运动复合体(SMA)的前/后分支在维持同相和反相运动模式方面是否具有明显的功能作用。12名健康成年受试者完成了由反相和同相试验组成的双指甲协调任务，24个通道的fNIRS数据从背侧-内侧运动区被记录下来。我们检测了位于前SMA(如Pre-SMA)和SMA本身的通道中氧合和脱氧血红蛋白的相对浓度。我们最有趣的结果表明，与同相运动相比，在进行反时相运动时，前SMA的氧合血红蛋白反应更大。在SMA本身，两种运动模式的氧合血红蛋白反应没有差别。这些数据表明，前SMA对编程和维持不太稳定的反时相运动模式至关重要，并支持SMA中逐渐复杂的功能的前向梯度的概念框架。
Bimanual movements can be performed by flexing and extending the target effectors (e.g., hand muscles) in unison, or by flexing units on one side in unison with extension of the same units on the opposite side. The former movement patterns are generally referred to as in-phase or parallel, whereas the latter patterns are often termed anti-phase movements. It is well known that anti-phase patterns are unstable and tend to spontaneously transition to in-phase movements at higher repetition rates, but the mechanisms and brain regions involved are not fully understood. In the current study, we utilized functional near-infrared spectroscopy (fNIRS) to evaluate whether anterior/posterior subdivisions of the supplementary motor complex (SMA) have distinct functional roles in maintaining in-phase and anti-phase movement patterns. Twelve healthy adult participants completed a bimanual coordination task comprised of anti-phase and in-phase trials as 24-channel fNIRS data was recorded from dorsal-medial motor areas. We examined the relative concentrations of oxygenated and deoxygenated hemoglobin in the channels that were located over the anterior SMA (e.g., pre-SMA) and the SMA proper. Our most interesting results indicated that oxygenated hemoglobin responses were greater in the anterior SMA during performance of anti-phase compared to in-phase movements. In the SMA proper, oxygenated hemoglobin responses did not differ between the two movement patterns. These data suggest that the anterior SMA is critical to programming and maintaining the less stable anti-phase movement patterns, and supports the conceptual framework of an anterior-directed gradient of progressively more complex functionality in the SMA.
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影响因子：
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