title: Evidence of a right-shift factor affecting infant hand-use preferences from 7 to 11 months of age as revealed by latent class analysis.
abstract: Infant hand-use preferences for apprehending objects were assessed three times at 7, 9, and 11 months of age for 154 infants (79 males) using a reliable and valid procedure. Two classification procedures (differing in Type I classification error rates) were used to identify an infant's preference (right, left, no preference) at each age, and these data were examined using two- and three-group latent class analysis models. These analyses revealed the importance of using a handedness classification procedure with low Type I error rates and evidence of a right-shift factor similar to that expressed in child and adult handedness. Thus, infant hand-use preferences for apprehending objects are likely a developmental precursor of adult handedness. The relation of the right-shift factor to increased susceptibility to social influences during development and the evolution of human abilities also is discussed.
authors.affiliation: Psychology Department, DePaul University, Chicago, IL 60614, USA.
authors.forename: George F
authors.initials: GF
authors.lastname: Michel
authors.forename: Ching-Fan
authors.initials: CF
authors.lastname: Sheu
authors.forename: Michele R
authors.initials: MR
authors.lastname: Brumley
mesh_terms: D000328:Adult; D002648:Child; D002657:Child Development; D002755:Choice Behavior; D005260:Female; D007839:Functional Laterality / Q000145:classification / Q000235:genetics; D006801:Humans; D007223:Infant; D008297:Male; D010641:Phenotype; D002666:Psychology, Child