Noticing latency is very context sensitive. A fun example is drawing lines on a touchscreen. Even ~20 milliseconds manifests as a visible gap between the tip of

Noticing latency is very context sensitive. A fun example is drawing lines on a touchscreen. Even ~20 milliseconds manifests as a visible gap between the tip of the pen and the line that "chases" it. Temporal resolution of human hearing obviously varies with what exactly you measure but I believe it is in a single digit millisecond range for discerning between two clicks in quick succession and a single click.