its temperature, the slipperiness of the handle, and so on. As that information streams up the spinal cord and into the brain, compensating information streams back down, passing like fast-flowing traffic on a two-way road. This information emerges from a complex choreography between parts of my brain with names like basal ganglia, cerebellum, somatosensory cortex, and many more. In fractions of a second, adjustments are made to the force with which I’m lifting and the strength of my grip. Through intensive calculations and feedback, I adjust my muscles to keep the cup level as I smoothly move
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