Sometimes treated as being synonymous with as mental retardation, and thus defined as an intellectual impairment (IQ<70) leading to functional disability. More generally, it is an individual’s inability to either interpret what is perceived, or to integrate information across modalities. Such limitations can be expressed in various ways (e.g., as specific difficulties with spoken and/or written language, movement coordination, self-control or deficits in attention).
See Attention, Developmental delay, Developmental disorders, Disorder, Disability, ‘g’, Intelligence, Mental retardation, Movement coordination