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The patterning of many developing tissues is orchestrated by gradients of morphogens through a variety of elaborate regulatory interactions. Such interactions are thought to make gradients robust, that is, resistant to changes induced by genetic or environmental perturbations; but just how this might be done is a major unanswered question. Recently(More)
Previous research on causal reasoning suggests that children can infer causal relations from patterns of events. However, certain associative models suggest that what appear to be cases of causal inference may simply reduce to children recognizing relevant associations among events, and responding based on those associations. In the present experiments,(More)
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