Figure 4.

Right arm choice from actual data, best-fit models, and reduced models. A: right arm choice measured by the spontaneous choice block in the no-time (white), the medium- (light gray) and the fast- (dark gray) time constraint conditions for RH, LH, and control groups. Note that the percentage of (left) paretic arm choice for the LH group is given by 100% minus right arm choice. B: average choice predicted by the best-fit models with effort and success: the models well predict the average right arm choice in all time conditions (compare with the data in A). C: fixed-effect coefficients significantly different from zero are indicated by *P < 0.05, **P < 0.01, ***P < 0.001. The success term is only significant for the LH group. The constant terms that are statistically positive for the control and LH groups indicate the bias of using the right arm. D: average choice predicted by the reduced models with the effort terms but without the success terms (model 1 in Table 1): the model for the LH group does not account for the modulation of arm choice with the time condition (compare with B). LH, left hemiparesis; n.s., not significant; RH, right hemiparesis.