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Physically handicapped children can derive exceptional benefits from computer applications. A careful evaluation of such applications is called for, however, to thwart unjustified hopes or claims. This paper describes the development and evaluation of a computer based environment, refered to as the ‘information prosthetic’. It consists of pointing devices and a computer program. In a large scale pre-test post-test design, the information prosthetic was evaluated on its effects on attention and cognitive- and emotional development of physically handicapped children aged four to eight. The experimental group worked five months, twice a week, during 20 minutes with the computer. Teacher questionnaires confirmed previous research that immediate effects may be considerable. In contrast however, an analysis of variance (ANOVA) showed long term treatment effects to be negligible.
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