Inclusion of Other in the Self Scale and the structure of interpersonal closeness.

Abstract

In 2 studies, the Inclusion of Other in the Self (IOS) Scale, a single-item, pictorial measure of closeness, demonstrated alternate-form and test–retest reliability; convergent validity with the Relationship Closeness Inventory (E. Berscheid et al, 1989), the R. J. Sternberg (1988) Intimacy Scale, and other measures; discriminant validity; minimal social desirability correlations; and predictive validity for whether romantic relationships were intact 3 mo later. Also identified and cross-validated were (1) a 2-factor closeness model (Feeling Close and Behaving Close) and (2) longevity–closeness correlations that were small for women vs moderately positive for men. Five supplementary studies showed convergent and construct validity with marital satisfaction and commitment and with a reaction-time (RT)-based cognitive measure of closeness in married couples; and with intimacy and attraction measures in stranger dyads following laboratory closeness-generating tasks. In 3 final studies most Ss interpreted IOS Scale diagrams as depicting interconnectedness. (PsycINFO Database Record (c) 2016 APA, all rights reserved)