Abstract
This paper is to study abnormality in motor development of the children from the standpoint of clinician.
Two major points are discussed.
1. Motor functions which are defined here as consisting of motility, manual faculty and speech are studied placing the emphasis on the correlation with the process of corticalization which manifests itself as the functional development from the reflex to the higher symbolic level according to Delacato-Domans's scale.
Especially the developmental apractognosia and developmental retardation of speech are discussed in terms of this corticalization process.
2. Statistical analysis of the abnormal motor behavior against the normal control is not statisfactory because the developmental process is the dynamic process between biological and environmental factors.
Above all, the development of children with brain damage is much more dependent upon the environmental factor than the normal children. This directly leads to the importance of the influence of therapist upon the children with brain damage.
Thus, it is indispensable to grasp variations of motor development in the constellation of the total behavior of the children.
