The purpose of the present study was to investigate the effects of addressee of verbalization, self or other, on insight problem solving. Thirty-five participants were assigned to one of the three conditions: toward-self verbalization, toward-other verbalization, or irrelevant verbalization (control). A 3-minute verbalization phase was inserted after 5 minutes of solving the T-puzzle. The participants were asked to write down their thoughts during the first 5 minutes as a record in the toward- self verbalization condition, and as an instruction for other participants in the toward-other verbalization condition. The participants in the control condition were required to write down their concerns. After that, they were asked to engage in the puzzle again for 10 minutes. The results showed a detrimental verbalization effect while allowed a wide range of effects for the self vs other distinction going in either direction. We are using this study as a basis for a pre-registered repo

There has been a debate on the process of insight problem solving. The special-process view posits that insight problemsolving processes are implicit unlike non-insight problem solving. The business-as-usual view, on the other hand, assumesthat the same processes as non-insight problem solving are involved in insight problem solving. To reconcile them, we canrely on the evidence on the verbal overshadowing effect on insight problem solving. However, there is a methodologicalproblem on how to determine whether the verbal overshadowing effect has emerged. The purpose of the present studywas to solve the problem using Bayes Factors. We reanalyzed the data presented in the previous studies examining theeffects of verbalization on insight problem solving. The results showed that some studies inappropriately concluded thatthe verbal overshadowing effect was not obtained. We also discussed possible moderating variables of the effect.