Check out this slideshow of robot hands from Wired. It tracks the evolution of the hand from the first attempts to duplicate the functionality of a human hand, to integration of self-monitoring proprioceptive and sensory capabilities, to replicating the anatomical and physiological structure of the human hand - both in order to better understand the biology, and to accommodate the connection of prostheses. On the way, it becomes obvious what a thing of complexity and beauty the human hand really is.
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DO you think that you perceive your body and the world around you as they really are? If your answer to that question is "yes", then think again.
In 2001, Yamamoto and Kitazawa showed that the perception of temporal order can be reversed when subjects cross their hands.
Thanks for this one, Jess. It's fascinating.