title: Numerical abilities in Williams syndrome: dissociating the analogue magnitude system and verbal retrieval.
abstract: Two numerical systems--the analogue magnitude system and verbal retrieval--were investigated in Williams syndrome (WS) with three numerical tasks: simple addition, simple multiplication, and number comparison. A new matching technique was introduced in selecting the proper control groups. The WS group was relatively fast in the addition and multiplication tasks, but was slow in number comparison. No reverse numerical effect was observed in the comparison task, and the distance effect was stronger than that in the control groups. The findings indicate a profile with an impaired analogue magnitude system and less impaired verbal retrieval in Williams syndrome.
authors.affiliation: University of Szeged, Department of Psychology, Institute of Psychology, Szeged, Hungary. krajcsi@gmail.com
authors.forename: Attila
authors.initials: A
authors.lastname: Krajcsi
authors.forename: Agnes
authors.initials: A
authors.lastname: Lukács
authors.forename: János
authors.initials: J
authors.lastname: Igács
authors.forename: Mihály
authors.initials: M
authors.lastname: Racsmány
authors.forename: Csaba
authors.initials: C
authors.lastname: Pléh
mesh_terms: D000293:Adolescent; D000704:Analysis of Variance; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008433:Mathematics; D011939:Mental Recall / Q000502:physiology*; D009483:Neuropsychological Tests; D011340:Problem Solving / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology; D014705:Verbal Behavior; D018980:Williams Syndrome / Q000503:physiopathology* / Q000523:psychology; D055815:Young Adult