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> The Third Thumb is worn on the opposite side of the palm to the biological thumb and controlled by a pressure sensor placed under each big toe or foot

IANAD, but I wonder what it would feel like to control it with the palmaris longus [0] instead. From what I understand, it doesn't really have an important role (14% of people don't even have it), and it's close to the skin, so an EMG could pick it up. It's also closer to the fingers, so it might be more intuitive to learn to repurpose it.

[0] https://en.wikipedia.org/wiki/Palmaris_longus_muscle



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