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Introducing IOS11 as an extended interactive version of the ‘Inclusion of Other in the Self’ scale to estimate relationship closeness

Baader, Malte; Starmer, Chris; Tufano, Fabio; Gächter, Simon

Introducing IOS11 as an extended interactive version of the ‘Inclusion of Other in the Self’ scale to estimate relationship closeness Thumbnail


Authors

Malte Baader

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CHRIS STARMER chris.starmer@nottingham.ac.uk
Professor of Experimental Economics

Fabio Tufano

SIMON GAECHTER simon.gaechter@nottingham.ac.uk
Professor, Psychology of Economic Decision Making



Abstract

The study of relationship closeness has a long history in psychology and is currently expanding across the social sciences, including economics. Estimating relationship closeness requires appropriate tools. Here, we introduce and test a tool for estimating relationship closeness: ‘IOS11’. The IOS11 scale has an 11-point response scale and is a refinement of the widely used Inclusion-of-Other-in-the-Self scale. Our tool has three key features. First, the IOS11 scale is easy to understand and administer. Second, we provide a portable, interactive interface for the IOS11 scale, which can be used in lab and online studies. Third, and crucially, based on within-participant correlations of 751 individuals, we demonstrate strong validity of the IOS11 scale in terms of representing features of relationships captured by a range of more complex survey instruments. Based on these correlations we find that the IOS11 scale outperforms the IOS scale and performs as well as the related Oneness scale.

Citation

Baader, M., Starmer, C., Tufano, F., & Gächter, S. (2024). Introducing IOS11 as an extended interactive version of the ‘Inclusion of Other in the Self’ scale to estimate relationship closeness. Scientific Reports, 14(1), Article 8901. https://doi.org/10.1038/s41598-024-58042-6

Journal Article Type Article
Acceptance Date Mar 25, 2024
Online Publication Date Apr 17, 2024
Publication Date Apr 17, 2024
Deposit Date Apr 19, 2024
Publicly Available Date Apr 19, 2024
Journal Scientific Reports
Electronic ISSN 2045-2322
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 14
Issue 1
Article Number 8901
DOI https://doi.org/10.1038/s41598-024-58042-6
Keywords Human behaviour; Psychology
Public URL https://nottingham-repository.worktribe.com/output/33837144
Additional Information Received: 27 November 2023; Accepted: 25 March 2024; First Online: 17 April 2024; : The authors declare no competing interests.

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