Since average scores on particular IQ tests rise a few points every 3 or 4 years, those tests become obsolete after a couple of decades. In order to reset the average score to 100, harder IQ tests are ...

Despite decades of research, mental retardation remains an amorphous concept defined not in black and white but in ever-changing shades of gray. As recently as 40 years ago, the condition was defined ...

Despite decades of research, mental retardation is an amorphous concept defined not in black and white, but in ever-changing shades of gray. As recently as 40 years ago, the condition was defined ...

Nonsyndromic mental retardation (NSMR) is the diagnosis of exclusion in mentally retarded individuals without additional abnormalities. We have recently identified a protein-truncating mutation, ...