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. 2014 Feb 14;5:109. doi: 10.3389/fpsyg.2014.00109

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Copyright © 2014 Takahashi and Watt.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Implications of different hypothetical hand-opening sensitivity functions for the signal weights of haptic size estimates with different tool gains. The top row shows the case where sensitivity to hand opening (JND as a function of hand opening) follows Weber's law: (A) sensitivity to hand opening; (B) the sensitivity in A re-plotted in units of object size, with different tool gains (0.7:1, 1:1, and 1.4:1; see main text for details), and a hypothetical visual sensitivity function; (C) the optimal signal weights that result from the sensitivities in panel (B), calculated using Equation 2. Panels (D–F) show the same calculations assuming a non-linear hand-opening sensitivity function.