Why a typing indicator keeps you in the conversation

A messaging app shows three bouncing dots when the other person is typing. Users who see the indicator wait an average of twenty-eight seconds longer before switching apps than users in a version without it. The message arrives in the same time in both versions; the dots changed the wait, not the speed.

What everyone sees

The typing indicator is treated as a courtesy — it tells you that a response is coming, so you can plan your time accordingly. The assumption is that it provides useful information: “don’t go anywhere, they’re replying.”

What is actually happening

The Zeigarnik effect predicts that an unfinished task occupies working memory more than a completed one. A typing indicator signals that a conversational turn is in progress but unfinished, which binds the user’s attention to the chat. Cialdini’s consistency principle adds that the user has already invested in the conversation by sending a message, and leaving before the reply arrives feels inconsistent with that investment.

Why it stays hidden

The binding hides because the user attributes the waiting to social politeness. “I’m waiting because it would be rude to leave while they’re typing” sounds like a social norm, not a design effect. But the dots are what made the typing visible, and without them, the user would have left without feeling rude.