PEDS302 Chapter Notes - Chapter 9: 18 Months, Retina

• School: University of Alberta
• Department: Physical Education and Sport
• Course: PEDS302
• Professor: Kelvin Jones

Document Summary

Maturationalist: halverson proposed 10 phases of development in. 1931: transition from power to precision grips, imposition of one task, one set of environmental conditions, hohlstein (1982): object size and shape influence type of grasp (by 9 months, infants shape hand to match object as they reach). Body scaling in grasping: grip movements are body scaled (newell, scully, tenenbaum, & hardiman, 1989: key is hand size relative to object size, more research is needed in infancy, ratio of hand size to object size is consistent for transitioning from using one hand to using two hands to pick up object. Hand mouth movements: at 3 to 4 months, infants become consistent in moving the hand to the mouth, by 5 months, they open the mouth in anticipation of the hand"s arrival. Bimanual reaching & manipulation: at 2 months, infants show bilateral arm extension and reaching. Role of posture: reaching improves when infants can maintain postural control.