人类小脑的感觉运动、语言和工作记忆表现。

Sensorimotor, language, and working memory representation within the human cerebellum.

机构信息

School of Physiology, Pharmacology and Neuroscience, University of Bristol, Bristol, UK.

Neurosurgery Department, Southmead Hospital, North Bristol Trust, Bristol, UK.

出版信息

Hum Brain Mapp. 2019 Nov 1;40(16):4732-4747. doi: 10.1002/hbm.24733. Epub 2019 Jul 30.

Abstract

The cerebellum is involved in a wide range of behaviours. A key organisational principle from animal studies is that somatotopically corresponding sensory input and motor output reside in the same cerebellar cortical areas. However, compelling evidence for a similar arrangement in humans and whether it extends to cognitive functions is lacking. To address this, we applied cerebellar optimised whole-brain functional MRI in 20 healthy subjects. To assess spatial overlap within the sensorimotor and cognitive domains, we recorded activity to a sensory stimulus (vibrotactile) and a motor task; the Sternberg verbal working memory (VWM) task; and a verb generation paradigm. Consistent with animal data, sensory and motor activity overlapped with a somatotopic arrangement in ipsilateral areas of the anterior and posterior cerebellum. During the maintenance phase of the Sternberg task, a positive linear relationship between VWM load and activity was observed in right Lobule VI, extending into Crus I bilaterally. Articulatory movement gave rise to bilateral activity in medial Lobule VI. A conjunction of two independent language tasks localised activity during verb generation in right Lobule VI-Crus I, which overlapped with activity during VWM. These results demonstrate spatial compartmentalisation of sensorimotor and cognitive function in the human cerebellum, with each area involved in more than one aspect of a given behaviour, consistent with an integrative function. Sensorimotor localisation was uniform across individuals, but the representation of cognitive tasks was more variable, highlighting the importance of individual scans for mapping higher order functions within the cerebellum.

摘要

小脑参与了广泛的行为。来自动物研究的一个关键组织原则是,躯体感觉对应输入和运动输出位于相同的小脑皮质区域。然而,缺乏人类中类似安排的令人信服证据,以及它是否扩展到认知功能。为了解决这个问题,我们在 20 名健康受试者中应用了小脑优化的全脑功能磁共振成像。为了评估感觉运动和认知领域内的空间重叠,我们记录了对感觉刺激(振动触觉)和运动任务的活动;斯特恩伯格言语工作记忆(VWM)任务;以及动词生成范式。与动物数据一致,感觉和运动活动在小脑前叶和后叶的同侧区域以躯体感觉排列重叠。在斯特恩伯格任务的维持阶段,观察到 VWM 负荷与右第六叶的活动之间存在正线性关系,在双侧 Crus I 中延伸。发音运动导致内侧第六叶的双侧活动。两个独立语言任务的结合在右侧第六叶-Crus I 期间定位动词生成的活动,与 VWM 期间的活动重叠。这些结果表明,人类小脑的感觉运动和认知功能具有空间分区,每个区域参与给定行为的多个方面,与整合功能一致。感觉运动定位在个体之间是一致的,但认知任务的表现更具可变性,突出了为映射小脑内更高阶功能而进行个体扫描的重要性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c38/6865458/d0d5402abcbf/HBM-40-4732-g001.jpg

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