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. Author manuscript; available in PMC: 2010 Mar 30.
Published in final edited form as: Exp Brain Res. 2005 May 24;165(1):69–83. doi: 10.1007/s00221-005-2282-1

Fig. 5.

Fig. 5

VH manipulation. a Normal forces of the thumb and VF versus the handle acceleration in the horizontal direction. A representative trial, the load was 11.3 N, the frequency was 3 Hz, representative subject no. 1. b Internal force and average normal force versus the handle acceleration. The range of the internal force fluctuations was approximately 8.0 N, from 12.0 to 21.0 N. c The thumb normal force–VF normal force phase angle [circular histogram, n=150 (six subjects × five loads × five frequencies)]