An IQ score lower than 20-25.
Example: A twelve year old child, though alert and responsive, is unable to dress himself and utters one- or two-word phrases at most.
Last reviewed: By John M. Grohol, Psy.D. on 26 Oct 2008
An IQ score lower than 20-25.
Example: A twelve year old child, though alert and responsive, is unable to dress himself and utters one- or two-word phrases at most.
Last reviewed: By John M. Grohol, Psy.D. on 26 Oct 2008