AbstractFor individuals with Cerebral Palsy (CP), functional reaching is key to maintaining independence. While previous research indicates benefits for multisensory input in CP, presently it is unknown when during goal-directed movements sensory input is integrated. This study considered the influence of an auditory stimulus during the planning or execution phases of a goal-directed reaching task. Three conditions were presented: No Sound (NS), Sound:Before (SB), and Sound:During (SD), which included a series of three tones presented over a 6s duration. Twenty adult participants (CP=10, TD=10) reached from a home switch to one of two targets, for a total of 60 trials. Infrared emitting diodes (IREDs) were placed on the index finger, second metacarpal, and wrist of the preferred arm to allow an Optotrak 3-D Investigator (250Hz) to record movement trajectories. Dependent variables were analyzed using a 2 Group x 2 Condition (SB-NS; SD-NS) ANOVA. Reaction time analysis demonstrated a significant main effect for condition, with decreased RT in the SB conditions for both groups. Analysis of variable error revealed significant main effects for group and condition, with the CP group executing more consistent movements in both the SB and SD conditions. Analysis of time to peak velocity (PV) divided by movement time revealed a significant group by condition interaction, indicating the CP group was able to achieve PV relatively earlier in the SB condition. Overall, the presence of a sound during movement planning (SB), improved both planning and execution of reaching movements for individuals with CP.
Acknowledgments: Many thanks to the participants for their time, to CP Manitoba and The Movement Centre, Inc. for assisting with recruitment, and to the funding organizations (NSERC, CFI, and Research Manitoba) for their support.