1. Concerning or causing physical activity associated with mental processes.
2. Relating to the psychological processes associated with muscular movement, and to the production of voluntary movements.
3. Relating to the combination of psychic and motor events, including disturbances.

Delay in the attainment of motor skills, language development, and social responsiveness in infancy and childhood.

A marked discordance between the degree of motor retardation and that of social response and alertness, as revealed by testing, may predict either cerebral palsy or a primary intellectual impairment.