Motor cortex study: effector regions alternate with somato-cognitive action network Nature WUSTLmed UCSanDiego motor cortex motorcortex neuroscience effectorregions brain science research
By Pooja Toshniwal PahariaApr 24 2023Reviewed by Lily Ramsey, LLM In a recent study published in the Nature Journal, researchers performed precision functional mapping and functional magnetic resonance imaging to map the functional organization of the motor cortex of the human brain.
About the study In the present study, researchers presented a dual system that melds action and body control into a common circuit and is characterized by a somato-cognitive action network alternating with M1 effector regions. The team used a motor and action functional MRI task battery to record concentric-shaped effector somatotopies, which were delineated by the CON-associated inter-effector regions . The relative timings of resting-state function MRI signals for the M1 regions were compared.
Results Regions with distinct connectivity, structure, and function interrupt the classic homunculus, alternating with effector-specific areas. The expected neuroimaging pattern comprised three RSFC-defined areas in each brain hemisphere, with connectivity limited to the homotopic contralateral motor cortex and the adjacent primary somatosensory cortex.
The IERs showed robust functional connectivity to the CON, which is essential for action and physiological control, sympathetic arousal, pain, and achieving goal-directed cognitive control. Macaque and pediatric precision fMRI indicated cross-species homologs and developmental IER system precursors. The IERs were also robustly linked to the surrounding cerebellar areas and the fundus of the central sulcus, Brodmann area 3a, involved in proprioception.
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