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From Piaget's early work to current theory of mind research, young children have been characterized as having little or no awareness of their mental activity. This conclusion was reexamined by assessing children's conscious access to visual imagery. Four-year-olds, 6-year-olds, and adults were given a mental rotation task in the form of a computer game, but with no instructions to use mental rotation and no other references to mental activity. During the task, participants were asked to explain how they made their judgments. Reaction time patterns and verbal reports revealed that 6-year-olds were comparable to adults both in their spontaneous use and subjective awareness of mental rotation. Four-year-olds who referred to mental activity to explain their performance had reaction time and error patterns consistent with mental rotation; 4-year-olds who did not refer to mental activity responded randomly. A second study with 5-year-olds produced similar results. This research demonstrates that conscious access to at least 1 type of thinking is present earlier than previously recognized. It also helps to clarify the conditions under which young children will and will not notice and report their mental activity. These findings have implications for competing accounts of children's developing understanding of the mind and for the "imagery debate".

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Real physical objects (e.g., a chair) can be distinguished from mental entities (e.g., a thought about a chair) on the basis of a number of criteria. 3 of these are behavioral-sensory evidence--whether the entity can be seen, touched, and physically acted upon; public existence--whether other persons experience the entity; and consistent existence--whether the entity consistently exists over time. Two studies tested 3-5-year-old children's ability to distinguish real versus mental entities on the basis of these criteria and to categorize such entities suitably. Even 3-year-olds were able to judge real and mental entities appropriately on the basis of the 3 criteria, to sort such entities as explicitly real and not-real, and to provide cogent explanations of their choices as well. A further distinction between real and mental entities is that mental entities can be about physically impossible, nonexistent things (e.g., a dog that flies). A third study demonstrated that 3-5-year-olds also appreciated this distinction. Taken together, these results contradict a common characterization of the young child as unaware of the fundamental ontological distinction between the internal mental world and objective reality. The implications of these findings are discussed for 3 other bodies of research: Piaget's characterization of young children as realists, Keil's theory of ontological development, and recent research on children's understanding of the mind.

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