Visual control of reaching and grasping in infants

Author(s): Ashmead, D. H.

Journal/Book: Develop Psychol. 1999; 35: 750 First St NE, Washington, DC 20002-4242, USA. Amer Psychological Assoc. 620-631.

Abstract: The role of visual input during reaching and grasping was evaluated,Groups of infants (5, 7, and 9 months old) and adults reached for an illuminated abject that sometimes darkened during the reach. Behavioral and kinematic measures were assessed during transport and grasp. Both infants and adults could complete a reach and grasp to a darkened object. However, vision was used during the reach when the object remained visible. Infants contacted the object more often when it remained visible,though they had longer durations and more movement units. In contrast, adults reached. Faster and more precisely during transport and grasp when the object remained visible. Thus, continuous sight of the object was not necessary, but when it was available, infants used it for contacting the object whereas adults used it to reach and grasp more efficiently.

Note: Article McCarty ME, Univ Massachusetts, Dept Psychol, Tobin Hall, Amherst,MA 01003 USA

Keyword(s): ANTICIPATORY HAND ORIENTATION; PREHENSION MOVEMENTS; MOVING-OBJECTS; DARK; COORDINATION; SIZE

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