An Alabama man challenged his death sentence after a murder conviction because of his varying results in a series of I.Q. tests.

The US Supreme Court won’t rule for now on how state courts should analyze the results of multiple IQ tests when determining if death row inmates have an intellectual disability that would bar their ...

Since the latter part of the 19th and early 20th centuries, intelligence tests have attempted to measure human intellectual capabilities. The most common assigns an intelligence quotient, or IQ, score ...

Intellectual disability is a disorder marked by below-average intellectual function and a lack of skills necessary for independent daily living. The condition begins in the developmental period. The ...