Attention to movement modulates activity in sensori-motor areas, including primary motor cortex
Attention to movement modulates activity in sensori-motor areas, including primary motor cortex
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DOI：
10.1007/s00221-001-0905-8
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发表时间：
2002-01-01
影响因子：
2
通讯作者：
Matthews, PM
中科院分区：
文献类型：
--
作者：
Johansen-Berg, H;Matthews, PM
对感觉刺激的注意调节行为反应和皮层活动。对运动的注意力也可以调节运动反应。例如，将注意力从暗示的动作上移开可以增加反应时间。这项研究使用功能性磁共振成像来确定运动皮层中对运动的注意力调节活动的位置。通过要求受试者执行并行分心物任务（向后计数）来减少对运动的注意。显示计数和运动之间负相互作用（即相对于单一任务条件的总和，在双重任务条件下激活减少）的感觉运动区包括补充运动区（SMA）、扣带回、扣带回和中央后回。单独的感兴趣体积分析显示，与中央前回的一部分、中央沟深处（被认为对应于区域4p）和SMA中的单一任务相比，双重任务中的平均信号变化百分比显著降低。我们的结论是，运动控制的大脑网络在多个地点，包括初级运动皮层的注意力调制。这些结果也讨论了参考理论的神经相关的双重任务的性能和心理计算和功能成像研究的正常和受损的运动性能的解释有影响。
Attention to sensory stimulation modulates behavioural responses and cortical activity. Attention to movement can also modulate motor responses. For example, directing attention away from cued movements can increase reaction times, This study used fMRI to determine where in the motor cortex attention to movement modulates activity. Attention to movement was reduced by asking subjects to perform a concurrent distractor task (counting backwards), Sensori-motor areas showing a negative interaction between counting and movement (i.e. reduced activation in the dual task condition relative to the sum of the single task conditions) included the supplementary rnotor area (SMA), cingulate cortex, insula and post-central gyrus. A separate volumes-of-interest analysis revealed significant reductions in mean percent signal change in the dual task compared to the single task in a portion of the pre-central gyrus, deep in the central sulcus (thought to correspond to area 4p) and SMA. We conclude that the brain network for motor control is modulated by attention at multiple sites, including the primary motor cortex. These results are also discussed with reference to theories concerning the neural correlates of dual task performance and mental calculation and have implications for the interpretation of functional imaging studies of normal and impaired motor performance.