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WISC IV belongs really to century of image and speed of transmissions. Indications of perceptive reasoning, speed of treatment, or working memory occupy as important place as the indices of verbal understanding. Language and manipulation so pass in second rank, what asking about the opportunity of using how clinical psychology refers on the epistemological concept: from body image to subject language, how to report impulsive and defensive dynamics which underlies any mental operation on a human being? Following a critical reflection on this tool, we propose a comparative clinical analysis between the indications about WISC IV and those about WISC III, based on our experience with dyspraxia andor in high potential subjects.