Turn-taking
The largely unconscious system people use to coordinate who's speaking and when, so a conversation flows without constant interruption or long, awkward silences.
A 2009 cross-linguistic study in the Proceedings of the National Academy of Sciences, led by Tanya Stivers, found a remarkably consistent median response gap of roughly 100 milliseconds across ten unrelated languages — genuinely faster than conscious reaction time, meaning ordinary conversation depends on anticipating the end of a turn, not simply reacting to it.
A caller doesn't consciously evaluate a system's timing the way a researcher would — they just experience the call as smooth or as slightly, naggingly wrong. A pause that runs noticeably long reads as the system ignoring them; jumping in early reads as rude, even when unintentional.
The most common mistake is assuming turn-taking is fundamentally about words rather than timing, which is at least as load-bearing and often more immediately noticeable. A related one: assuming a longer pause reads as more careful, the way it can in writing — in live conversation it almost always reads as confusion instead.
Handling the natural back-and-forth of a call — knowing when a caller has actually finished versus paused mid-thought — is treated as core to how the voice system is designed, covered on Voice.
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