![]() ![]() Thus, head control and body stability are necessary for the emergence of grasping. ![]() The relationship between posture and reaching is tight. The findings suggest that early reaching is constrained by head and shoulder instability. Sitter infants show a majority of differentiated reaches in all posture conditions.Ī study conducted by Esther Thelen on postural control during infancy used the dynamic systems approach to observe motor development. Non-sitter infants, although showing strong tendencies toward bimanual reaching, tend to reach with one hand when sat. ![]() Analysis of hand-to-hand distance during reaching indicates that in the prone and supine posture, non-sitting infants moved their hands simultaneously towards the midline of their bodies as they reached which is not observed by stable sitting infants in any position. Regardless of whether they can self-sit, infants can adjust their two handed engagement in relation to the arrangement of the objects being reached for. ![]() When "non-sitting" infants reached bimanually, while seated upright, they often ended up falling forward. On the other hand, if the infant does not have body control, it would be hard for them to get a hold of an object because their reach will be limited. As a result, their grasping phases will not have been maximized because of the decrease in body control. It was also found that the posture needed to be controlled because infants that were not able to sit on their own used bimanual reaches in all postural positions except sitting upright, where they would reach one-handed. The precision of the reach is potentially maximized when placed centrally. It was found that the object reached for needed to be controlled. A study was done by Philippe Rochat at Emory University in 1992 to test the relation between progress in the control of posture and the developmental transition from two-handed to one-handed engagement in reaching. In 1952, Piaget found that even before infants are able to reach for and successfully grasp objects they see, they demonstrate competent hand-mouth coordination. Infants begin to reach for and grasp objects at this age. Hand-eye coordination begins to develop at two to five months. Infant displaying the palmar grasp reflex ![]()
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