RESEARCH ARTICLES The Developmental Course of Habituation in Infancy and Preschool Outcome John Colombo Department of Psychology and Schiefelbusch Institute for Life Span Studies University of Kansas D. Jill Shaddy Department of Psychology University of Kansas W. Allen Richman Schiefelbusch Institute for Life Span Studies University of Kansas Julie M. Maikranz Clinical Child Psychology Doctoral Program University of Kansas Otilia M. Blaga Department of Psychology University of Kansas A longitudinal sample of 226 infants were tested monthly on habituation and novelty preference tasks, augmented with simultaneous heart rate recording from 3 to 9 months of age. Infants were then administered the Bayley Scales of Infant Develop- ment II (BSID) and MacArthur Communicative Development Inventory (MCDI) at INFANCY, 5(1), 1–38 Copyright © 2004, Lawrence Erlbaum Associates, Inc. Requests for reprints should be sent to John Colombo, Department of Psychology, University of Kan- sas, 426 Fraser Hall, 1450 Jayhawk Boulevard, Lawrence, KS 66045–7535. E-mail: colombo@ ku.edu Do Not Copy