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首页> 外文期刊>Journal of Neurophysiology >Grasp with hand and mouth: a kinematic study on healthy subjects.
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Grasp with hand and mouth: a kinematic study on healthy subjects.

机译：用手和嘴抓握：对健康受试者的运动学研究。

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Neurons involved in grasp preparation with hand and mouth were previously recorded in the premotor cortex of monkey. The aim of the present kinematic study was to determine whether a unique planning underlies the act of grasping with hand and mouth in humans as well. In a set of four experiments, healthy subjects reached and grasped with the hand an object of different size while opening the mouth (experiments 1 and 3), or extending the other forearm (experiment 4), or the fingers of the other hand (experiment 5). In a subsequent set of three experiments, subjects grasped an object of different size with the mouth, while opening the fingers of the right hand (experiments 6-8). The initial kinematics of mouth and finger opening, but not of forearm extension, was affected by the size of the grasped object congruently with the size effect on initial grasp kinematics. This effect was due neither to visual presentation of the object, without the successive grasp motor act (experiment 2) nor to synchronism between finger and mouth opening (experiments 3, 7, and 8). In experiment 9 subjects grasped with the right hand an object of different size while pronouncing a syllable printed on the target. Mouth opening and sound production were affected by the grasped object size. The results of the present study are discussed according to the notion that in an action each motor act is prepared before the beginning of the motor sequence. Double grasp preparation can be used for successive motor acts on the same object as, for example, grasping food with the hand and ingesting it after bringing it to the mouth. We speculate that the circuits involved in double grasp preparation might have been the neural substrate where hand motor patterns used as primitive communication signs were transferred to mouth articulation system. This is in accordance with the hypothesis that Broca's area derives phylogenetically from the monkey premotor area where hand movements are controlled.
机译：先前已在猴子的运动前皮层中记录了用手和嘴进行抓握准备的神经元。本运动学研究的目的是确定一种独特的计划是否也是人类用手和口部抓握行为的基础。在一组四个实验中，健康的受试者张开嘴（实验1和3）或伸出另一前臂（实验4）或另一只手的手指（实验）时，用手抓住并抓住了一个大小不同的物体5）。在随后的三组实验中，受试者张开右手的手指，用嘴抓住了一个大小不同的物体（实验6-8）。最初的嘴和手指张开的运动学特征，而不是前臂伸展的初始运动学特征，与被抓物体的大小以及初始抓握运动学特征的大小影响一致。这种效果既不是由于对象的视觉呈现，没有连续的抓握运动（实验2），也不是由于手指和嘴张开之间的同步（实验3、7和8）。在实验9中，受试者用右手抓住了一个大小不同的物体，同时在目标上念出一个音节。所握物体的尺寸会影响张口和发声。根据以下概念讨论了本研究的结果：在一个动作中，每个动作在运动序列开始之前就已准备好。双重抓握准备可用于连续的运动作用于相同的物体，例如，用手抓握食物并将其放入口中后将其摄取。我们推测，参与双重抓握准备的电路可能是神经基质，其中用作原始通信标志的手运动模式已转移到口部关节运动系统。这符合这样的假设，即布罗卡氏区从系统控制猴子活动的猴子运动前区衍生出。

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