. The comparison of subtests, "arrows" and "picture completion" on one hand, and "object assembly" and "block design" on the other, showed that children with autism are capable of mobilizing correct configural processing in the first ones but not in the second. The only factor which differentiates these tasks is the appeal or not to a motor coordination. It is possible that the lack of motor ease, often described in this type of children, sometimes leads them towards strategies of low level, i.e