Construction subtype is inability to assemble pieces into a whole; usual cause is right hemisphere lesion. Ideational subtype is inability to plan coordinated actions; cause is diffuse bilateral disease or toxic state. Ideokinetic subtype is inability to to link ideation with and motor performance; cause is lesion in submarginal gyrus. Kinetic subtype is inability to use one hand or arm to perform manual tasks; cause if focal lesion of precentral contralateral cortex.