In regard to poor showing on cognitive tasks,
Joe Biden mounting stairs to Air Force One
people are generally thought to be optimal or near-optimal in performing low-level motor control and perception tasks.
Planning goal-directed movement, like pressing an elevator button with your finger or placing your foot on a slippery river stone, requires your motor control system to pick one among a dizzying number of possible movement strategies to achieve your goal while minimizing biomechanical costs.
The cognitively impaired are unable to pick one
among these dizzying number of options so you fall up the stairs instead of walking up them, which requires
the momentous task for some (Joe Biden) of putting one foot after the other.
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