The accuracy and stability of self-image of 21 mentally retarded adults and 24 non-retarded adults were studied. The subjects were confronted with a distorting mirror that made their faces look either fatter or slimmer. Results showed that retarded adults saw themselves are more distorted than did non retarded adults. Both the precision and the stability of retarded adults' self-image were significantly correlated with IQ. Results were interpreted within a cognitive framework.