An experiment was conducted to examine the coupling of force variability in bimanual finger tapping sequences with asymmetrical forces. Right-handed participants were trained to produce bimanual finger tapping sequences consisted of an intertap interval of 500 ms and eight force conditions: two alternating force left high, two alternating force right high, two simultaneous force left high, and two simultaneous force right high conditions. During practice, visual force feedback was provided for both hands performing the bimanual tapping sequences. After practice, the participants produced the learned tapping sequences in the absence of feedback. Most importantly, whereas the peak force variability of the nondominant left hand was larger than that of the dominant right hand under the right high conditions, there was no left–right difference under the simultaneous left high conditions. This suggests that under the simultaneous left high conditions, both hemispheres were activated, resulting in overflow in the right hand, and bringing the two force variabilities closer together.
Brice Guignard, Annie Rouard, Didier Chollet, Marco Bonifazi, Dario Dalla Vedova, John Hart and Ludovic Seifert
doi:10.1080/02640414.2014.996181 10.1080/02640414.2014.996181 Peper , C.E. , Beek , P.J. , & van Wieringen , P.C.W. ( 1995 ). Multifrequency coordination in bimanual tapping: Asymmetrical coupling and signs of supercriticality . Journal of Experimental Psychology: Human Perception and