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. 2018 Jun 15;4(6):eaat0098. doi: 10.1126/sciadv.aat0098

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Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 5 — (A) Schematic for signature sensing. (B to D) Resistance change to (B) signature and (C and D) OK written by different volunteers. (E) Schematic for vocal sensing. (F to H) Resistance change in response to similarly sounding letters “B,” “D,” and “E.”