People had self-insight into their momentary extraversion, conscientiousness, & likely neuroticism, suggesting that people can accurately detect fluctuations in some aspects of their personality; but not so much for agreeableness

Sun, Jessie, and Simine Vazire. 2018. “Do People Know What They’re Like in the Moment?.” PsyArXiv. September 9. doi:10.31234/osf.io/sg5aw

Abstract: Knowing yourself requires knowing not just what you are like in general (trait self-knowledge), but also how your personality fluctuates from moment to moment (state self-knowledge). We examined this latter form of self-knowledge. Participants (248 people; 2,938 observations) wore the Electronically Activated Recorder (EAR), an unobtrusive audio recorder, and completed experience sampling (ESM) self-reports of their personality states four times each day for one week. We estimated state self-knowledge by comparing self-reported personality states to consensual observer ratings of personality states coded from the EAR files, which formed the criterion for what participants were “actually” like in the moment. People had self-insight into their momentary extraversion, conscientiousness, and likely neuroticism, suggesting that people can accurately detect fluctuations in some aspects of their personality. However, the evidence for self-insight was weaker for agreeableness. This apparent self-ignorance may be partly responsible for interpersonal problems and for blind spots in trait self-knowledge.