To establish methods of training the voluntary control of the activity of a single motor unit on children (previously reported on adults), a series of electromyographic experiences was undertaken. Healths children from 3 to 12 years of age were trained to gradually and consciously suppress the neuromuscular activity and to isolate and maintain in a repetitive activity a single motor unit chosen into the rhomboid muscle. The degree of motar control was verified qualitatively and quantitatively with no body movements and during the activity of drinking. Inhibition and maintenance of a single motor unit in the activity during drinking were successful. This was most evident among the 7- to 9-year-old children. The children demonstrated the same motor ability as adults, and the variation between age groups consists mainly in the duration of attention span. The observation of doublets with young normals is at least similar in frequency as with adults.