Abstract
According to a neurogeometric motion theory, S would experience changes in normal feedback information as perturbations in executing copying and handwriting activities. Sensory feedback mechanisms in such psycho-motor skill performances seem to depend on perceptual-motor abilities and thus play an important role in such behavior. Hence, a parallel developmental trend regarding feedback control in copying/handwriting behavior was expected. A study organized as a two-way design with 48 students aged 7 to 11 yr. was carried out. The results showed that different forms of displaced feedback had different negative effects on accuracy and speed in copying/handwriting performances, whereas an improved feedback control in the same functions could be observed from CA 7 to 11. No interaction effects were found between the two independent factors under research.

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