“…We collected 4,198 discussion scripts from the "CQCHAT" chat system during the 2 nd -7 th lectures. In the current study, such scripts were encoded into 3 categories of social presence including 18 indicators by using an automated text classification system (Yamada et al, 2015;Taniguchi et al, 2019) as follows: "affective" includes expressions of emotions (EMOTIONS), use of humor (HUMOR), self-disclosure (SELF-DISCLOSURE), use of unconventional expressions (PARALANGUAGE) and expressing value (VALUE); "open communication" includes continuing a thread (THREAD), quoting from other's messages (QUOTING), referring explicitly to other's messages (REFERRING), asking questions (QUESTION), complimenting or expressing appreciation (APPRECIATION), expressing agreement (AGREEMENT), expressing disagreement (DISAGREEMENT), and personal advice (ADVICE); "group cohesion" includes addressing or referring to participants by name (VOCATIVE), addressing the group as group (INCLUSIVE), serving a purely social function (PHATIC), social sharing (SOCIAL-SHARING), and course reflection (REFLECTION).…”