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J Neurophysiol (March 17, 2004). doi:10.1152/jn.00960.2003
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Submitted on October 3, 2003
Accepted on March 11, 2004

Interlimb transfer of novel inertial dynamics is asymmetrical

Jinsung Wang* and Robert L. Sainburg

* To whom correspondence should be addressed. E-mail: jinsung{at}psu.edu.

Mechanisms underlying interlimb transfer of adaptation to visuomotor rotations have recently been explored in depth. However, little data are available regarding interlimb transfer of adaptation to novel inertial dynamics. The present study, thus, investigated interlimb transfer of dynamics by examining the effect of initial training with one arm on subsequent performance with the other, in adaptation to a 1.5 kg mass attached eccentrically to the forearm. Using inverse dynamic analysis, we examined the changes in torque strategies associated with adaptation to the extra mass, and with interlimb transfer of that adaptation. Following initial training with the dominant arm, non-dominant arm performance improved substantially in terms of linearity and initial direction control, as compared to naive performance. However, initial training with the non-dominant arm had no effect on subsequent performance with the dominant arm. Inverse dynamic analysis revealed that improvements in kinematics were implemented by increasing flexor muscle torques at the elbow to counter load-induced increases in extensor interaction torques, as well as increasing flexor muscle torques at the shoulder to counter the extensor actions of elbow muscle torque. Following opposite arm adaptation, the non-dominant arm adopted this dynamic strategy early in adaptation. These findings suggest that dominant arm adaptation to novel inertial dynamics leads to information that can be accessed and utilized by the opposite arm controller, but not vice versa. When compared to our previous findings on interlimb transfer of visuomotor rotations, our current findings suggest that adaptations to visuomotor and dynamic transformations are mediated by distinct neural mechanisms.




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