The involvement of working memory and inhibition functions in the different phases of insight problem solving.

In this article, the involvement of working memory capacity and inhibition functions in different phases of insight problem solving is investigated, by employing a method of separating the different phases of insight problem solving directly, on the basis of the subjects' oral reports. Two experiments are described. In Experiment 1, 87 subjects were administered a series of working memory span tasks and inhibition tasks, as well as a verbal insight problem. In Experiment 2, 119 subjects were administered the same working memory span tasks and inhibition tasks as in the first experiment, as well as a spatial insight problem. Several conclusions can be drawn from this study. First, the insight problem-solving process can be divided into several relatively independent phases, including an initial searching phase and a restructuring phase. Second, executive functions, as measured by working memory capacity, influence mainly the initial searching phase, rather than the restructuring phase. Third, inhibition functions play important but complex roles in restructuring, and sometimes could influence restructuring in contradictory ways simultaneously. The implications and value of this study are discussed further.