Hand-use and tool-use in grasping control.

摘要: The goal of this study was to elucidate the underlying mechanisms hand and tool grasping control. We assumed that there is a single principle-governing control irrespective its effectors degree prior experience effector determines smoothness aperture Eight participants performed reach-to-grasp task with four different effectors: index finger thumb, middle chopsticks, scissor-like tool. Although we employed large mechanical variations degrees use, maximum grip scaled as function object size appeared at almost same timing in all types movements. Moreover, reaching time did not substantially differ among conditions. However, plateau duration profile differed by effector. Plateau longest unfamiliar condition. There no difference between hand-use grasp thumb familiar tool-grasp chopsticks. had shortest duration. These results supported idea an effector-independent continuity tool-use motor rather than conventionally dichotomy them.