Focusing effects in predecisional information acquisition.

Legrenzi et al. [Legrenzi, P., Girotto, V., & Johnson-Laird, P. N. (1993). Focusing in reasoning and decision making. Cognition, 49, 37-66] showed that when a single option is proposed for consideration the decision makers limit their information acquisition to this one option, failing to take into account potential alternatives. Unfortunately, the evidence supporting this focusing effect is weak and its determinants are largely unknown. In three experiments, we provided stronger support for the reality of the focusing effect and we identified two significant determinants of this phenomenon. The results show that both representational and value-related manipulations are able to reduce the effect. Results also suggest the need to distinguish between two different types of focusing: representational focusing and search-related focusing.