“…Saviolo-Negrin, Soresi, Baccichetti, Pozzan, and Trevisan (1990) reported no signifi cant age difference 1. The reports by George, Thewis, Van der Linden, Salmon and Rondal (1999, submitted for publication) contain the results of corresponding investigations carried out with the same adult participants with Down syndrome on a number of major cognitive functions (general behavioural and cognitive abilities -using a French-language adaptation of the Dementia Questionnaire for Mentally Retarded Persons, of Evenhuis, Kengen, and Eurlings, 1990; the Batterie pour l'Examen Psychologique de l'Enfant -evaluating a large range of cognitive functions including memory, lexicon, visual perception and hand movements, and adapted in French from the K-ABC of Kaufman and Kaufman, 1993; working memory, visuospatial as well as auditory-vocal, episodic memory, retrospective and prospective memory -using a modifi ed version of the Children's Version of the Rivermead Behavioural Memory Test, RBMT-C, of Wilson, IvaniChalian, and Aldrich, 1991 -and attention -using the Barcelona Test of Péna-Casanova, 1990). These results will not be presented here.…”