Kinesiology 3347A/B Lecture Notes - Lecture 9: Neurodegeneration, Motor Skill, Tennis Ball
21 Apr 2016
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Prehension: the grasping of an object, typically with the hand(s) Halverson proposed phases of grasping development in 1931: filmed infants grasping 1 inch cube, transition from power to precision grips. 4 months: grasp with thumb on top. Hohlstein used different object sizes & shapes: influence type of grasp (by 9 months, infants shape hand to anticipate/match object as they reach) Would have argued that cns is the main driver of motor development: this is not necessarily the case. When you switch object sizes, infant regresses: providing evidence that environment/task have influence on the motor skill. Researchers observed prehension longitudinally from age 9 weeks to 37 weeks. Thus, demonstrating that neuromotor maturation is not the only structural constraint. Clear evidence that grasp used by infants depended on the property of the object. How do you shape your hand to pick up the following: golf ball, tennis ball, baseball.
