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Humans are known to be able to solve problems creatively, but how exactly this occurs is still a matter of debate. Insight problem solving is one important way to study creativity in adults, but studies that use this method with preschool children are rare. In this paper, we present two studies: one in which the problem is solved with known objects (participants were preschool children aged 4 to 7 years) and one in which new objects were created (participants were children aged 5 to 6 years and adults). For both studies, results are discussed in relation to the various processes that can explain insight problem solving. We argue that the integration of these processes under the overarching variability-stability-flexibility pattern might be a better way to investigate insight and ultimately to understand innovation.

The known inversion in the sense of enantiomeric preference in baker's yeast reductions of phenacyl alcohols and their acetates is applied to the reduction of ketones (III) and (V) to give benzofuranyl diols (IV) in both enantiomeric forms. Baker's yeast reduction of ketones (I) gives the benzofuranyl ethanols (II). Because non-fermenting conditions are proved to be most selective for the reduction of test ketones (Ia) and (IIIa), similarly the other ketones are also reduced under these conditions. -(PAIZS, C.; TOSA, M.; MAJDIK, C.; MOLDOVAN, P.; NOVAK, L.; KOLONITS, P.; MARCOVICI, A.; IRIMIE, F.-D.; POPPE*, L.; Tetrahedron: