Title

Damage to the Insula Is Associated with Abnormal Interpersonal Trust

Abstract

Reciprocal trust is a crucial component of cooperative, mutually beneficial social relationships. Previous research using tasks that require judging and developing interpersonal trust has suggested that the insula may be an important brain region underlying these processes (. King-Casas et al., 2008). Here, using a neuropsychological approach, we investigated the role of the insula in reciprocal trust during the Trust Game (TG), an interpersonal economic exchange. Consistent with previous research, we found that neurologically normal adults reciprocate trust in kind, i.e., they increase trust in response to increases from their partners, and decrease trust in response to decreases. In contrast, individuals with damage to the insula displayed abnormal expressions of trust. Specifically, these individuals behaved benevolently (expressing misplaced trust) when playing the role of investor, and malevolently (violating their partner's trust) when playing the role of the trustee. Our findings lend further support to the idea that the insula is important for expressing normal interpersonal trust, perhaps because the insula helps to recognize risk during decision-making and to identify social norm violations.

Department(s)

Psychological Science

Comments

This study was supported by the James S. McDonnell Foundation (Grant # 220020387), the Kiwanis Foundation, and NINDSP01 NS19632.

Keywords and Phrases

Brain Lesion; Decision-Making; Insula; Social Cognition; Trust

International Standard Serial Number (ISSN)

0028-3932

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2015 Elsevier Ltd, All rights reserved.

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