Figure 3.

(a) Moisture levels and (b) static grip forces for the finger pad of a single subject as a function of sequential grip and release procedures on a manipulandum defined in terms of a trial number. The points are the mean values obtained from 20 blocks of trials, and the associated bars represent±1 s.d. The subject (S2) was judged to have dry skin and the data demonstrate that the sequential contact in this case results in an increase in the moisture level with a corresponding reduction in the grip force required to stabilize the position of the manipulandum. Adapted from André et al. [80].