The ‘homunculus’ diagram depicts a deformed constellation of body parts mapped onto a narrow strip of the brain, showing the corresponding brain regions that control each part. Now a study reveals that this brain strip is far more complex than we thought
, based on data from people whose arms had been amputated above theelbow. They suggested that there are two systems in the primary motor cortex: one for motor commands and another for muscle synergies that enable coordinated movement.In the latest study, Nico Dosenbach, a neuroscientist at Washington University in St.
Three coloured spots on each half of the brain show areas that were strongly connected to other regions responsible for goal-driven action planning and tasks such as regulating blood pressure and pain. The hotter the colour, the denser the connections.The findings weren’t a fluke: the researchers found the same regions lighting up in large data sets from previously scanned individuals.
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