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. Author manuscript; available in PMC: 2010 Feb 23.
Published in final edited form as: J Mot Behav. 2007 Jul;39(4):276–290. doi: 10.3200/JMBR.39.4.276-290

FIGURE 5.

FIGURE 5

Tangential forces of (A) the thumb and (B) the virtual finger: group averages and standard errors (bars). The solid line represents the thumb at high friction contact (HFC), and the dotted line represents the thumb at low friction contact (LFC). When one finger was at LFC, Combinations 1, 2, 3, and 4 corresponded to LHHH, HLHH, HHLH, and HHHL, respectively (the four-letter sequences here indicate friction at the index, middle, ring, and little fingers, respectively). When two fingers were at LFC, Combinations 1, 2, 3, 4, 5, and 6 corresponded to LLHH, HLLH, HHLL, LHLH, HLHL, and LHHL, respectively. When three fingers were at LFC, Combinations 1, 2, 3, and 4 corresponded to LLLH, HLLL, LLHL, and LHLL, respectively.