Fig. 1

a Subject 1: Learning to switch to power grip for a glass. b Subject 2: Learning to switch from tripod grip to power grip for a tennis ball. c Subject 3: Learning to switch from power grip to lateral grip to hold a knife
a Subject 1: Learning to switch to power grip for a glass. b Subject 2: Learning to switch from tripod grip to power grip for a tennis ball. c Subject 3: Learning to switch from power grip to lateral grip to hold a knife