Visual pathway deficit in female fragile X premutation carriers: a potential endophenotype
Szabolcs Kéri1, György Benedek
1Semmelweis University, Department of Psychiatry and Psychotherapy, H1083 Budapest, Hungary. szkeri@phys.szote.u-szeged.hu
Abstract:
Previous studies indicated impaired magnocellular (M) and relatively spared parvocellular (P) visual pathway functioning in patients with fragile X syndrome. In this study, we assessed M and P pathways in 22 female fragile X premutation carriers with normal intelligence and in 20 healthy non-carrier controls. Testing procedure included visual contrast sensitivity and vernier threshold measurements. Results revealed that carriers were selectively impaired on tests of M pathways (low spatial/high temporal frequency contrast sensitivity and frequency-doubling vernier), whereas they showed intact performance on P pathway tests. These results suggest that the deficit of the M pathway is an endophenotype of fragile X syndrome.
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