In three studies of infants' ability to perceive partially occluded objects with specific appearances, a screen alternately uncovered and covered either a connected or interrupted rectangle. Pattern of infants' looking times suggests that they perceive the unity of the partially occluded object by 6.5 months but did not perceive the form of the…

Argues that dynamic systems approaches may provide an explanatory framework based on general scientific principles for developmental psychology, using principles of self-organization to explain how novel forms emerge without predetermination and become increasingly complex with development. Contends that self-organization provides a single…

Two studies examined developmental changes in handwriting variability. Results indicated that, between 3 and 5 years, the number of grip patterns that children routinely use declines and the variability associated with pen-surface positioning declines. Older 3-year-olds used an adult grip pattern more often and were less variable in pen-surface…

Investigated the ability of young children to recognize themselves in delayed videotapes and recent photographs. Results suggested a significant developmental delay in young children's success on mark tests of self-recognition using delayed feedback as compared to live feedback, which may have important implications for characterizing the…

Examined children's ability to describe, understand the causes of, and realize the value of three types of pain. Preschoolers, elementary school students, and college students were interviewed using open-ended questions. Although older children had more complex and precise understandings of pain, this pattern differed according to the type of pain…

Investigated the manner in which the temporal order and variability of events influence three and seven year olds' event representation. Children participated in three events: a logical-invariant, a logical-variable, and an arbitrary-invariant event. Both the structure of the event and children's representational capabilities influenced children's…

Argues that the operating characteristics of perceiving and remembering provide a foundation for progress on detailing the processes through which knowledge is realized in real-time tasks and in detailing the processes of developmental change. Includes three examples to illustrate how forming developmental hypotheses in terms of perceiving and…

Explored sex differences in adolescent preference for older versus younger mates. Found that teenage males were willing to date females of a wide age range, whereas teenage females prefer dating males from their own age to several years older. Data suggested viewing development of sex differences in dating partner preference from the perspective…