The effect of available choices on ambiguity aversion: An examination of different types of ambiguity

Shinya Masuda, Takayuki Sakagami, Sumire Hirota

Research output: Contribution to journalArticle


Ellsberg's two-color problem, known as an example of ambiguity aversion, has generated a great deal of interest among many researchers. However, an unsettled question remains regarding the conditions that lead to heightened or diminished ambiguity aversion. We conducted a series of experiments, which required participants to choose between a clear and vague bet. Results showed that participants did not always prefer the clear bet, and the ratios of those who indicated ambiguity aversion varied depending on the types of ambiguity. Furthermore, ambiguity aversion consistently decreased when participants were allowed to choose the ambiguity task they would perform. These results were interpreted in terms of the pattern of second order probability distributions and illusion of control.

Original languageEnglish
Pages (from-to)34-41
Number of pages8
JournalShinrigaku Kenkyu
Issue number1
Publication statusPublished - 2002



  • Ambiguity aversion
  • Choice
  • Illusion of control
  • Second order probability distribution

ASJC Scopus subject areas

  • Psychology(all)

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