original_query: What was the purpose of the study conducted by Ely Rabin and Andrew M. Gordon in 2004?
query: What was the purpose of the study conducted by Ely Rabin and Andrew M. Gordon in 2004 using the Magic Wand?
answer: To study proprioception signals in humans related to fingertip contact on surfaces by creating vibrations in the left biceps brachia using the Magic Wand.