Transitive gesture production in apraxia: Visual and nonvisual sensory contributions

The production of transitive limb gestures is optimized when the appropriat e tool can be physically manipulated Little research has addressed the inde pendent contributions of visual and nonvisual sources of sensory informatio n to this phenomenon. In this study, 12 control. 37 LHD, and 50 RHD stroke patients performed transitive limb gestures to pantomime (to verbal command with the (object visible) and object manipulation. Performance was more ac curate in the object manipulation condition, suggesting that haptic and kin esthetic cues are important for transitive gesture production. Various patt erns of performance were observed in the stroke groups, indicating that sel ective damage to the haptic/kinesthetic processing system is possible and c ommon following unilateral stroke. (C) 2001 Academic Press.