Perceived willingness drops significantly after 600–800 ms of silence
Ratings of perceived willingness drop noticeably at 600 ms and become statistically significant between 700 and 800 ms, based on the 2013 gap-tolerance study by Roberts and Francis.
Supporting evidence
Voice Agent Function Calling: Real-Time Data Lookup Guide
Original excerpt
Ratings of perceived willingness drop off noticeably at 600ms in the classic 2013 gap-tolerance study from Roberts and Francis, and the difference turns statistically significant between 700 and 800ms.
Context
Dead air is what the caller hears while your handler works, and it costs you fast. InjectAgentMessage is what covers that silence in the reference pattern.
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