Three experiments examined whether preschoolers recognize that the causal properties of objects generalize to new members of the same set given either deterministic or probabilistic data. Experiment 1 found that 3- and 4-year-olds were able to make such a generalization given deterministic data but were at chance when they observed probabilistic…

Linguistic and cognitive competencies of preschoolers were revealed by interviewing them about routine activities. It was found that freeing preschoolers' speech from constraints inherent in talking about the immediate context results in their demonstrating control over a variety of language-related skills that are generally assumed to be beyond…