Flindall Jason, Gonzalez Claudia L R
Psychology, University of British Columbia, Vancouver, British Columbia, Canada.
Department of Kinesiology and Physical Education, University of Lethbridge, Lethbridge, Alberta, Canada.
Atten Percept Psychophys. 2019 Oct;81(7):2217-2236. doi: 10.3758/s13414-019-01805-5.
Evidence from electrophysiology suggests that nonhuman primates produce reach-to-grasp movements based on their functional end goal rather than on the biomechanical requirements of the movement. However, the invasiveness of direct-electrical stimulation and single-neuron recording largely precludes analogous investigations in humans. In this review, we present behavioural evidence in the form of kinematic analyses suggesting that the cortical circuits responsible for reach-to-grasp actions in humans are organized in a similar fashion. Grasp-to-eat movements are produced with significantly smaller and more precise maximum grip apertures (MGAs) than are grasp-to-place movements directed toward the same objects, despite near identical mechanical requirements of the two subsequent (i.e., grasp-to-eat and grasp-to-place) movements. Furthermore, the fact that this distinction is limited to right-handed movements suggests that the system governing reach-to-grasp movements is asymmetric. We contend that this asymmetry may be responsible, at least in part, for the preponderance of right-hand dominance among the global population.
电生理学证据表明，非人类灵长类动物基于其功能最终目标而非运动的生物力学要求来产生抓握动作。然而，直接电刺激和单神经元记录的侵入性在很大程度上排除了在人类中进行类似研究的可能性。在本综述中，我们以运动学分析的形式呈现行为证据，表明人类中负责抓握动作的皮层回路以类似方式组织。尽管针对相同物体的后续两种动作（即抓握进食和抓握放置）的机械要求几乎相同，但抓握进食动作产生的最大抓握孔径（MGA）明显更小且更精确。此外，这种差异仅限于右手动作这一事实表明，控制抓握动作的系统是不对称的。我们认为，这种不对称可能至少部分地导致了全球人口中右手优势的普遍存在。
