The first part of this paper summaarizes the various studies conducted on the motor development of infants, and the remaining sectionss covers our studies on the development of locomotive behavior as larval adaptation in early childhood from aspects of motor ability, attachment and locomotive spatial schemes derived from locomotive tracks. The subjects, 10-41 months old, entered a playroom (11×13 m) with their mother, and video recording was done while the position coodinates (X. Y) were detected through a supersonic transmitter carried on the child'back. Each child was observed for about 30 min, one to three times a day. In the first 30 min (first session) the mother sat in a corner of the room and child was left to play freely. In the second and third sessions, the conditions were changed, such as having other persons in the room. Based on the locomotive range, velocity, distance and speed, motor development could be divided into three stages: I, quadrupedal to bipedal transition (10-17 mo), II, bipedal development (17-29 mo), and III, bipedal maturity (29-41 mo). Stage I was characterized by attachment behavior such as staying for long periods in the vicinity of the mother (First Base) and The locomotive distance from FB was within 5 meters. Stage II showed increased motor ability with age. The locomotive pattern was predominantly running mostly to and from the mother (FB) and a toy box (SB), then another toy box (TB) or virious fixtures (FoB) and the mother functions as a resting place, being a landmark of locomotion rather than a subject of attachment. In Stage III, more frequent approaches were made to strangers or the furthest toy box, and the period of staying and playing there was extended with less loconxotion.
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