Tourette syndrome is a neurodevelopmental disorder believed to be genetic. The most visible symptom is the presence of tics. These involuntary movements or sounds can range from simple (sniffing, throat clearing, blinking) to complex (words or phrases, hopping, body contortions). They may be frequent for a few weeks, then fade away almost…

This article provides an overview of current research on Fragile X Syndrome, and how that knowledge can be used to guide successful intervention. The genetic etiology of Fragile X is reviewed and the physical, cognitive, adaptive, behavioral, and emotional phenotypes of children with the disorder are described, highlighting the differences in…

Background: Five DNA markers (single-nucleotide polymorphisms, SNPs) have recently been found to be associated with general cognitive ability "g") in a sample of 7414 7-year-old twins. These children have also been studied at 2, 3, 4, and 7 years of age on measures of cognitive and language development and behaviour problems; family environment…