r and the left hemisphere to cognitive familiarity and routinization. Since this functional asymmetry was first proposed (Goldberg and Costa, 1981; Goldberg et al., 1994a), it has found support with various neuroimaging tech- niques, including PET (Gold et al., 1996; Shadmehr and Holcomb, 1997), fMR1 (Henson e

r and the left hemisphere to cognitive familiarity and routinization. Since this functional asymmetry was first proposed (Goldberg and Costa. 1981; Goldberg et al., 1994a), it has found support with various neuroimaging tech- niques, including PET (Gold et al., 1996; Shadmehr and Holcomb, 1997), fMRI (Henson e

he right hemi- sphere) versus exercise of established routinized behaviours (the left hemisphere) (Goldberg & Costa, 1981; Goldberg & Podell, 1995; Goldberg et al., 1994b). Within this general framework, the lateral- ized nature of the effects of frontal-lobe damage in humans has been demonstrated. Damage to t