Fig. 7.

Grip force and grip force rate trajectories from five single trials per subject, superimposed within subject. Data are taken from the first session, sandpaper surface, beginning on the first trial after 10 practice lifts. Seven subjects each were selected randomly from Groups I and IV. Tactile sensibility threshold (Semmes–Weinstein filaments) at the finger is indicated for each subject, along with other positive findings from each subject’s health history.