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. Author manuscript; available in PMC: 2011 May 28.
Published in final edited form as: J Biomech. 2010 Feb 24;43(8):1476–1482. doi: 10.1016/j.jbiomech.2010.01.037

Figure 1.

Figure 1

Instrumentation and configuration to assess the force-displacement relation (stiffness) for the perioral tissues. The equal-arm scissor cantilever and stainless steel lip saddles (hooks) positioned for imposing increases in interangle span and automated stiffness sampling. A lip span adjustor accommodates to individual differences in lip aperture and used to set initial position (L0 + 15 mm). The stainless steel 0.020” shimstock chin anchor articulated on a needle bearing and was positioned over the subject’s mental symphysis for vertical stabilization. InVivo Metrics 4 mm Ag/AgCl surface electrodes placed over orbicularis oris superior (OOS) and orbicularis oris inferior (OOI) muscle recording sites.