The relationship between mental state decoding and real-world social functioning - An experience sampling investigation.

Introduction: Social cognition, particularly Theory of Mind (ToM), is thought to play a crucial role in social functioning. Patients with psychosis often exhibit ToM deficits, but research findings on associations with social outcomes in daily life remain conflicting. Objectives: This study investigated the relationship between mental state decoding, a core aspect of ToM, measured by the Reading the Mind in the Eyes Test (RMET), and quantity and subjective quality of real-life social interactions in patients with psychosis, first-degree relatives, and controls. Methods: A 7-day Experience Sampling Method (ESM) design assessed the number and quality of real-life social interactions, including time spent alone vs. in social company, loneliness, feelings of social exclusion, preferences for company, being alone by choice, enjoyment of solitude, and perceived relationship quality in 27 patients with psychosis, 17 first-degree relatives, and 26 controls. All participants completed the RMET. Results: Patients scored lower on the RMET compared to both relatives (β = -0.13, Conclusions: Lower RMET performance was linked to greater feelings of social exclusion across groups but was unrelated to other indicators of real-life social functioning, including social emotions or frequency of social interactions. This finding is in line with other recent ESM studies, and highlights the importance of other, possibly more proximal factors for real-life social functioning.