Representations of Fine Digit Movements in Posterior and Anterior Parietal Cortex Revealed Using Long-Train Intracortical Microstimulation in Macaque Monkeys
Representations of Fine Digit Movements in Posterior and Anterior Parietal Cortex Revealed Using Long-Train Intracortical Microstimulation in Macaque Monkeys
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DOI：
10.1093/cercor/bhx279
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发表时间：
2018-12-01
期刊：
影响因子：
3.7
通讯作者：
Krubitzer, Leah
中科院分区：
文献类型：
--
作者：
Baldwin, Mary K. L.;Cooke, Dylan F.;Krubitzer, Leah
目前对猕猴的研究利用长训练皮质内微刺激来确定可以发出运动的皮质的范围。运动不仅来自运动区(PMC和M1)，也来自顶后(5，7a，7b)和顶前区(3b，1，2)。只涉及食指(D2)和拇指(D1)的手指运动的大型表征是从区域1、2、7b和M1引出的。从这些区域引发的其他运动与其他灵长类动物中描述的与行为学相关的运动相似。这些动作包括前肢和嘴巴的组合动作和全手抓握。然而，许多其他动作要复杂得多，不能归入前面描述的任何行为学类别。模仿精确抓握的特定手指动作是猕猴独有的，在新大陆或原猴灵长类中没有描述过。我们认为，在某些类人血统中，这些多个和扩展的手指运动表示与对位拇指的出现和握力类型的改变是共同进化的。
The current investigation in macaque monkeys utilized long-train intracortical microstimulation to determine the extent of cortex from which movements could be evoked. Not only were movements evoked from motor areas (PMC and M1), but they were also evoked from posterior parietal (5, 7a, 7b) and anterior parietal areas (3b, 1, 2). Large representations of digit movements involving only the index finger (D2) and thumb (D1), were elicited from areas 1, 2, 7b, and M1. Other movements evoked from these regions were similar to ethologically relevant movements that have been described in other primates. These include combined forelimb and mouth movements and full hand grasps. However, many other movements were much more complex and could not be categorized into any of the previously described ethological categories. Movements involving specific digits, which mimic precision grips, are unique to macaques and have not been described in New World or prosimian primates. We propose that these multiple and expanded motor representations of the digits co-evolved with the emergence of the opposable thumb and alterations in grip type in some anthropoid lineages.