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Eryk P. Przysucha and Brian K.V. Maraj

The nature of intra- and interlimb (bimanual) coordination was examined in ten boys with (M = 10.5 years, SD = 1.0) and without DCD (M = 10.8 years, SD = .9) in a two-handed catching task. Children with developmental coordination disorder (DCD) caught significantly fewer balls (MDCD = 56%, SD = 17.6 vs. MnoDCD = 93%, SD = 7.5), and both groups solved the “degrees of freedom problem” differently at intralimb level of coordination. Typically developing children coupled and decoupled the respective spatial relations, whereas the majority of children with DCD segmented their actions. At interlimb level, both groups exhibited a comparable degree of spatial symmetry. However, individual profiles also showed that children with varying degrees of movement issues exhibited movement patterns that were qualitatively and functionally diverse. Overall, in the context of previous research on interlimb coordination it appears that spatial, in addition to temporal organization, may be jeopardized in at least some children with DCD.

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Brian K.V. Maraj, Li Li, Rebecca Hillman, Jennifer J. Jeansonne, and Shannon D. Ringenbach

This study examined motor learning in persons with Down syndrome (DS), persons with undifferentiated developmental disabilities (UnDD), and persons without disabilities (ND). Participants were instructed (either by verbal instruction or visual demonstration) to move a cursor to three items displayed on a computer screen. Results indicated that the ND group had superior performances to the other two groups for both instruction conditions. Participants with DS performed the task with both longer response and movement times when instructed verbally. In a transfer condition, results revealed the UnDD group displayed poor transfer, while participants with DS showed positive transfer from visual to verbal protocols. These results provide some evidence that persons with DS may be able to consolidate visual information to facilitate verbal-motor learning.