The causal connective “because” requires the order of clauses within a sentence to violate the order of events in the real world; i.e., “effect because cause” is correct. Children's (4, 6, and 8 years of age) ability to comprehend “because” was explored in a series of four studies. The first, a replication with variations of existing studies, assessed children's ability to judge as anomalous sentences in which the order of clauses is reversed. Comprehension of impersonal sentences is better than of sentences derived from narratives of their own experiences, although children do poorly at this task until age 8. However, results of study 2 suggest that children's poor understanding of task requirements is partly responsible, since increased task instructions and modeling led to significant improvement in the ability of preschoolers to judge sentences as anomalous. In the third study, children named the cause event after being told a causal sequence (involving either psychological or physical causality) of the form: Event A, “Event C (effect) because Event B (cause),” Event D. Comprehension of physical causality sequences is superior, but again, only 8-year-olds showed good performance. In Study 4, children were asked to find the cause event in four-clause sequences of the same form as in Study 3, but memory props were added in the form of pictures of events A, B, and D. Near perfect performance was shown by all children. Overall, comprehension studies of “because” are judged to be rife with methodological problems, and memory demands are seen to be particularly important.
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