From his first attempts to explain attachment phenomena in the 1940s through his "Attachment and Loss" trilogy (Bowlby, 1969/1982, 1973, 1980), John Bowlby reformulated the theoretical underpinnings of attachment theory several times. He initially attempted to explain attachment phenomena in psychoanalytic terms. Then he invoked…

Current prominent models of identity face challenges in bridging across divergent perspectives and apparent dichotomies such as personal or social-collective, conscious or unconscious, and epigenetic or discursive-relational, and affording pursuit of research questions that allows integrative answers. This article presents a coherent theoretical…

P. Hegarty (2009) offered several critiques of the articles by G. Rieger, J. A. W. Linsenmeier, L. Gygax, and J. M. Bailey (2008) and K. D. Drummond, S. J. Bradley, M. Peterson-Badali, and K. J. Zucker (2008) that were published in a "Developmental Psychology" special section entitled "Sexual Orientation Across the Lifespan," guest-edited by C. J.…

Growth modeling is a useful tool for studying change over time, and it is becoming increasingly popular with developmental researchers. There is a considerable methodological literature surrounding growth modeling for individuals; however, far less attention has been focused on growth models for pairs of related individuals (i.e., dyads). In this…

This article presents an overview of quantitative methodologies for the study of stage-sequential development based on extensions of Markov chain modeling. Four methods are presented that exemplify the flexibility of this approach: the manifest Markov model, the latent Markov model, latent transition analysis, and the mixture latent Markov model.…

Describes a computer program that simulates the emergence of affiliation networks in preschool groups and examines theoretical issues raised by the model. The simulation implies that triadic interactions are not essential in the formation of affiliative structures and that polyadic friendship groupings can be understood as sets of dyadic…

Describes connectionist model showing exclusivity asymmetries when categorizing visual stimuli, similar to pattern shown by infants. Examines asymmetries in terms of an associative learning mechanism, distributed internal representations, and statistics of feature distributions in the stimuli. Details test of model with infants, finding that…