An experiment conducted at Milano-Bicocca University in Milan, Italy, demonstrated that sound as well as sight can powerfully affect the brain's sensations of the body. When a recording of a hammer striking marble exactly matched taps on a subject's concealed hand, subjects felt as if their arms were turning to stone. If the sound did not sync with the actual taps, there was no such reaction. Experts say this research could lead to prostheses with more a natural function and feel.
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