(b) Behaviour Observation Audiometry: Auditory signal presented to an infant produces a change in behaviour, e. g. Alerting, cessation of an activity, widening of eyes or facial grimacing.

（b）行为观察力测定：呈现给婴儿的听觉信号会使其行为发生变化，例如发生警觉、停止某项活动、睁大眼睛或做鬼脸。