title: Development of role-differentiated bimanual manipulation in infancy: Part 2. Hand preferences for object acquisition and RDBM--continuity or discontinuity?
abstract: This second paper in a series of three investigated the development of hand preference for role-differentiated bimanual manipulation (RDBM) relative to the infant's hand preference for object acquisition and to the infant's hand-use for acquiring the objects used to assess RDBM. The same 90 infants (30 with a right preference, 30 with a left preference, and 30 with no preference to acquire objects) from the first paper were tested from 9 to 14 months for hand preference for acquiring those objects used to assess RDBM and for a hand preference for RDBM. Multilevel analysis revealed that infants with a hand preference for acquiring objects decreased in their use of the preferred hand for object acquisition during the 11 to 14 month interval, which coincided with the development of a hand preference for RDBM. These results are discussed in relation to the cascade theory of hand preference development.
authors.affiliation: Department of Physical Therapy, University of Delaware, 115 HSC, UD, Newark, DE 19713. ibabik@udel.edu.
authors.forename: Iryna
authors.initials: I
authors.lastname: Babik
authors.affiliation: Department of Psychology, University of North Carolina at Greensboro, NC.
authors.forename: George F
authors.initials: GF
authors.lastname: Michel
mesh_terms: D002657:Child Development / Q000502:physiology*; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006225:Hand; D018737:Hand Strength; D006801:Humans; D007223:Infant; D008137:Longitudinal Studies; D008297:Male; D009048:Motor Skills / Q000502:physiology*; D055361:Multilevel Analysis
keywords: bimanual manipulation; development; hand preference; infancy; reaching