Extinction Burst
A temporary increase in the frequency, duration, or intensity of a behaviour when extinction is first implemented.
When you suddenly remove reinforcement, a behaviour gets worse before it gets better. This predictable spike is an extinction burst. The learner tries harder, longer, or louder to access the reinforcement they used to get easily.
Extinction bursts frustrate caregivers and often involve new topographies - a child who previously cried might start throwing items. If you reinforce the behaviour during a burst, you teach the learner that escalating their behaviour works.