Thresholds can be measured by tracing stimulus change until perception flips

Evidence

In the method of limits, an attribute of a sound event is changed automatically or by the experimenter, and the sound is presented to the subject during an interval. The subject can be given a detection task, reporting whether the stimulus was present in an interval. The gathered data are then used to measure absolute thresholds. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 916