Mind or Muscle?

You will find this trick will create considerable discussion, because it appears to be a genuine test of mindreading as well as a novel interpreting of involuntary muscular reactions. The routine is carefully worked out, and the problem is presented directly, simply, and without sleights or manipulations.

Effect

Three people each select cards and return them to the pack in a manner which allays suspicion. The deck is returned to the performer who ribbon spreads it face up across the table. The first card is found by holding the person's wrist and passing his hand over the pasteboards. The second card is found in the same way. And the third card is named by the performer who touches his fingertips to the forehead of the person selecting the last card.