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Subnormal and normal children, of like mental age, were compared on a visual target localization task. Severely subnormal children were found to be less accurate than normal children, in conditions where they visually directed or visually guided their hand to the target and received visual knowledge of results. On visually directed localizations without knowledge of results or with proprioceptive knowledge of results (same hand) no significant difference was found between normal and severely subnormal children. Another experiment with moderately subnormal children revealed that developmental changes on visually directed and visually guided localizations are a function of mental age rather than chronological age.

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Down's syndrome and non-Down's syndrome subjects, matched for mental and chronological age, were compared on a drawing task. The stimulus shape had to be remembered and reproduced after either multimodal visual-kinaesthetic stimulation or unimodal visual or kinaesthetic input only. Drawing took place either with or without visual guidance of the drawing hand. Drawing skill was assessed according to the dimensions of shape, size and orientation as well as movement control.It was found that in general the presence of visual input information was more helpful for those without than for those with Down's syndrome in shape approximation. In contrast, Down's syndrome subjects tended to make better use of kinaesthetically derived information, especially in regard to orientation and movement control. 0261-510X/83/040317-11 S02.00/0 0 1983 The British Psychological Society Development. London: Academic Press.