Interplay of Conditional Reasoning and Politeness: The Role of Speaker Relationships in the Japanese Context

This study investigates how inter-speaker relations influence the interpretation of conditional statements “if p1 then q” and conditional reasoning, focusing on Japanese participants. The suppression paradigm of conditional reasoning reveals that adding additional conditional “if p2 then q” can suppress MP reasoning, “p1, therefore q”. Based on politeness theory, the study examines whether the interpretation of ambiguous additional conditionals varies according to the relationship between the speakers, and how this variation affects conditional reasoning. Results indicated that introducing an additional conditional decreased the perceived plausibility of conditional and inverse sentences, but the relationship between the speakers had no significant impact on the interpretation of additional conditionals and probability assessments. The presence of additional conditionals influenced MP, MT, and DA reasoning, but AC reasoning was not impacted. The study underscores the importance of context and cultural nuances in the interpretation of conditional statements and highlights the need for further research to understand the factors that influence the interpretation of conditional sentences in different cultural settings.