Three concepts regarding the sense that others can notice one's inner self have been proposed. However, the differences and relationships among these concepts have not yet been elucidated. This paper reviews these different concepts and the associated research literature. First, preconditions for arousing this sense of the inner self being noticed by others are discussed. Then, illusions of transparency (cf., Gilovich, Savitsky, & Medvec, 1998), feelings of self-leakage (cf., Tanno & Sakamoto, 2001), and feelings of transparency (cf., Tabata, 2006a) are reviewed and the characteristics of each concept are clarified by comparing and organizing them. Perspectives for investigating the relationships among these concepts are discussed.
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