26 October 2016
Vol 8, Issue 362

About The Cover

Cover image expansion

ONLINE COVER Artificially Tickling the Ivories. This image shows two hands playing the piano. The natural hand has the ability to sense delicate changes in pressure in order to know how much force to apply on the keys, but the artificial hand does not. Applying variable pressure is a challenge for arm amputees because current neuroprosthetics lack the sense of touch. Graczyk et al. studied two upper-limb amputees implanted with electrodes in order to understand how the number and frequency of nerve firings contributed to perception of pressure intensity. [CREDIT: KENZIE GREEN]