Generalization of implicit and explicit adjustments to visuomotor rotations across the workspace in younger and older adults

Heuer H, Hegele M. Generalization of implicit and explicit adjustments to visuomotor rotations across the workspace in younger and older adults. J Neurophysiol 106:2078-2085, 2011. First published July 20, 2011; doi:10.1152/jn.00043.2011.-We examined the generalization of adjustment to a visuomotor rotation across the workspace in younger and older adults. Participants practiced in the right workspace with a single target direction and were tested in both the right and left workspace with eight different target directions. A set of tests served to identify implicit and explicit components of adjustment. Explicit, but not implicit, components were stronger at younger than at older adult age. Explicit components generalized across all target directions, whereas implicit components were restricted to the target direction during practice and clockwise adjacent ones. Generalization to the contralateral workspace was found only for explicit components of adjustment. These findings expand the list of functional differences between implicit and explicit components of adjustment to visuomotor transformations.