Digital connection, real bonding: Brief online chats boost interpersonal closeness regardless of the conversational topic.

As discussed in the results section, the fact that abstract concepts also showed a trend to lead to interactions that were perceived to be slightly more difficult made us decide to include this as an additional covariate, which is the final model we used.

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The other main dependent variable, physical-interpersonal closeness, also did not yield strong evidence for an interaction between other-contribution and concept category (logit estimate = 0.01, SE < 0.005, 95 % CrI [0.00, 0.02]), although a clear trend.

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There was no main effect of concept type (abstract versus concrete) on iOS values, with only a numerical trend for abstract concepts leading to lower iOS scores (logit coefficient = −0.20, SE = 0.5, 95 % CrI [−1.18, +0.80]).

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