“…The aim of the experiment was to investigate the effects of specific hints or training on insight problem solving. The impact of general meta-cognitive training on performance has been addressed in previous literature (e.g., Walinga et al, 2011; Patrick and Ahmed, 2014; Patrick et al, 2015), as has the impact of more specific hints which have been customized to the contents of a specific problem (e.g., Chronicle et al, 2001, Experiment 3; Weisberg and Alba, 1981; Grant and Spivey, 2003; Kershaw and Ohlsson, 2004; Kershaw et al, 2013; Öllinger et al, 2013, 2014). What we aimed to focus on here, and to further test based on the results of the experiment, was the hypothesis that thinking in contraries might support transformations in the mental representation of a problem, as required by insight problem solving.…”