高等研究所 訪問研究員・訪問学者 セミナー: “Reducing Affective Polarization through Diversity Exposure: Evidence from a VAA Field Experiment in Japan” by Marta Gallina and Stefano Camatarri (7/9)
要旨/Abstract
This paper investigates whether Voting Advice Applications (VAAs), by exposing voters to a diverse set of politically relevant alternatives, can reduce affective polarization. While VAAs are primarily designed to inform electoral choices and increase political knowledge, we argue that their personalized presentation of ideologically diverse parties may also mitigate negative attitudes toward political outgroups. Drawing on a randomized field experiment conducted in 2024 in Japan, a context characterized by a long-term reign of a governing party and a dominant-party system, we find that exposure to a VAA significantly reduces affective polarization. Notably, the effect is strongest among voters who typically rely on valence-based evaluations rather than issue-based reasoning, i.e. supporters of the dominant Liberal Democratic Party (LDP). These findings suggest that VAAs, beyond their intended informational and educational functions, can serve as effective tools for mitigating partisan hostility by broadening voters’ perceived political choice set. However, the effect appears to be short-lived, fading after the election period.
講演者/Speaker
GALLINA, Marta (Associate Professor, Catholic University of Lille)
CAMATARRI, Stefano (Research Fellow, Catholic University of Louvain & Catholic University of Lille)
共同研究者/Collaborators
Airo Hino (Waseda University), Marta Gallina (Catholic University of Lille), Stefano Camatarri (Catholic University of Louvain), Robert Andrew Fahey (Waseda University), Uwe Serdült (Ritsumeikan University and University of Zurich)
日時/Date&Time
7月9日（木） 13:10–14:50 / July 9, 2026 (Thu.) 13:10 – 14:50
開催場所/Venue
早稲田大学 早稲田キャンパス 3号館 1106教室/ Room #1106, Building #3, Waseda Campus, Waseda University
対象/Prospected Audience
学生・研究者・教職員・一般 /Students, Graduate students, Faculty members, Research members, General Participants
言語/Language
英語/English
主催/Organizer
早稲田大学高等研究所 / Waseda Institute for Advanced Study (WIAS)
現代政治経済研究所 世論・メディアデータ研究部会 / Public Opinion and Media Data Research Group, WINPEC, Waseda University
企画：日野 愛郎（政治経済学術院 教授）
参加方法/Registration
事前登録不要/Pre-registration not required.
