Using a new paradigm for measuring children's saving behaviors involving two marble games differing in desirability, we assessed whether 3-, 4-, and 5-year-olds saved marbles for future use, saved increasingly on a second trial, saved increasingly with age, and were sensitive to the relative value of future rewards. We also assessed whether…

Examined nascent understanding of desire in cases where a child judges another's desire while holding a strong conflicting desire. Found that difference in ability to attribute beliefs versus desires to others is not due solely to difference in representational nature of two mental states; instead, beliefs differ from desire in their potential to…

Tested 6- and 8-year olds' ability to construct irony in story-completion tasks. Found that story stems based on familiar events, for which structured, detailed representations are available, facilitated irony more than did less-familiar activities, supporting irony as a metarepresentational skill. Young children's irony manipulated cognitively…

Three experiments (sorting and theory-of-mind tasks) examined whether, for preschoolers, a particular form of reasoning applied to theory-of-mind and a set of problems requires understanding of mental states. Found that advances in theory of mind, card sorting, and causality depend on ability to switch judgments across conditions; reasoning by…

Reviews "The Epigenesis of Mind: Essays on Biology and Cognition" (S. Carey and R. Gelman, editors), a collection of essays that present a hard-scientific vision of cognitive development. Examines the arguments this work articulates and then determines the place it occupies in the analysis of the state of developmental psychology as presented in…

Investigated children's understanding of meaning of the cognitive verb "know" (as defined by an abstractness and conceptual difficulty hierarchy). Found that knowledge increased with development, and low levels of meaning were mastered before high levels, and more rapidly. Understanding in audio-taped stories was more difficult than in video-taped…