 A total of forty-two 42 subjects with bilateral lower extremity amputations will be enrolled. Subjects will be randomized for assignment into two treatment conditions: twenty-one 21 subjects will use direct observation of another persons foot movements while twenty-one 21 will use mental visualization of foot movements which will serve as the control group. Subjects in each group will be further be randomized for assignment into six treatment groups: direct observation or mental visualization of right lower extremity movements alone, direct observation or mental visualization of left lower extremity movements alone, or direct observation or mental visualization of simultaneous bilateral lower extremity movements. Subjects will use their assigned therapy for 20 minutes daily. The subjects for this study will be recruited from the Walter Reed Army Medical Center WRAMC Amputee clinic. Up to sixty 50 subjects will be recruited and screened according to the inclusion and exclusion criteria since we expect that some may not qualify or drop-out sooner than the scheduled 4-month completion time. 