Extinction in psychology is the gradual weakening and disappearance of a learned behavior when the conditions that originally maintained it are removed. If a dog learned to salivate at the sound of a bell because the bell always came with food, the salivation will fade once the bell stops being paired with food. If a child learned that screaming gets a parent’s attention, the screaming will eventually stop once it no longer produces that attention. The core principle is the same in both cases: behaviors that stop “working” tend to fade away.
This concept shows up across two major branches of learning theory, and it plays a central role in therapies for anxiety, phobias, and OCD.
How Extinction Works in Classical Conditioning
In classical conditioning, an animal or person learns to associate two things that happen together. The textbook example is Pavlov’s dogs: a bell (a neutral signal) repeatedly paired with food (which naturally triggers salivation) eventually causes the dog to salivate at the bell alone. Extinction happens when that pairing stops. Present the bell over and over without food, and the salivation response gradually fades.
This process is trial-based, not time-based. What matters is the number of times the signal appears without the expected outcome, not how long each exposure lasts. With each unreinforced trial, the animal is essentially learning that the signal no longer predicts anything meaningful. Importantly, the strength of the original learning matters too. If the bell predicted food 100% of the time during training, the absence of food is highly informative, and extinction proceeds relatively quickly. If the bell only predicted food some of the time, extinction takes longer, because the absence of food on any given trial isn’t surprising.
How Extinction Works in Operant Conditioning
Operant conditioning is about behaviors and their consequences. You do something, it produces a reward (or removes something unpleasant), and you do it more. Extinction here means removing that consequence entirely. The behavior no longer “pays off,” so it gradually drops away.
A straightforward example: a rat presses a lever and gets a food pellet. Stop delivering the pellet, and the rat will eventually stop pressing the lever. In everyday life, this looks like a child who stops raising their hand in class because the teacher never calls on them, or an employee who stops suggesting ideas in meetings because they’re consistently ignored.
The Extinction Burst
One of the most important things to understand about extinction is that behavior typically gets worse before it gets better. This temporary spike is called an extinction burst, a short period where the frequency, intensity, or duration of the behavior increases as the individual tries harder to get the result they’re used to.
Think about a vending machine. You put in your money, press the button, and nothing comes out. Your first response isn’t to shrug and walk away. You press the button harder, press it multiple times, maybe hit the side of the machine. That escalation is an extinction burst. You’re increasing the intensity of the behavior before you eventually give up.
This pattern is visible everywhere:
- Toddler tantrums: A parent who decides to stop giving in to tantrums will often see the tantrums escalate in volume and duration before they begin to subside. The child is testing whether more extreme behavior will restore the old payoff.
- Pet training: A dog that used to get treats for a trick and suddenly stops receiving them will perform the trick more persistently, sometimes adding variations, before giving up.
- Online trolling: When provocative comments are met with indifference instead of outrage, the troll often escalates before eventually losing interest.
Understanding extinction bursts is critical for anyone trying to change behavior, because this is the stage where most people give in. If a parent caves during the tantrum escalation, the child learns that escalating works, making the behavior harder to extinguish next time.
Why Behaviors Come Back After Extinction
Extinction doesn’t erase the original learning. The brain doesn’t delete the old association; it forms a new, competing memory that says “this signal no longer predicts that outcome.” Because both memories exist, the old behavior can resurface under certain conditions. This is one of the most well-established findings in learning science, and it shows up in three distinct patterns.
Spontaneous Recovery
After a behavior has been fully extinguished, it can reappear simply because time has passed. If Pavlov’s dog stopped salivating at the bell after repeated unreinforced trials, and then heard the bell again days or weeks later, the salivation would partially return. This happens because the passage of time creates a shift in context. The extinction memory was formed in a specific temporal window, and when that window changes, the brain defaults toward the older, original memory. More thorough extinction training reduces the likelihood and strength of spontaneous recovery.
Renewal
A behavior extinguished in one environment can return when the individual is placed back in the original environment where the behavior was first learned, or in an entirely new environment. The extinction memory is somewhat tied to the context where it was formed. Change the context, and the old behavior has a chance to re-emerge.
Reinstatement
If the original reinforcer reappears on its own, even without being paired with the behavior or signal, the extinguished response can come back. For example, if a fear response to a tone was extinguished, simply experiencing the aversive event again (unrelated to the tone) can partially restore the fear response to the tone. In addiction research, this is a major concern: encountering the substance, related cues, or stress after a period of abstinence can trigger a return of drug-seeking behavior.
The Partial Reinforcement Effect
How quickly a behavior extinguishes depends heavily on how it was reinforced in the first place. Behaviors that were rewarded every single time they occurred extinguish relatively fast. Behaviors that were only rewarded some of the time are far more resistant to extinction. This is called the partial reinforcement extinction effect.
The reason comes down to uncertainty. When a behavior has always been rewarded, the very first unreinforced instance is a clear signal that something has changed. But when rewards were unpredictable to begin with, the absence of a reward on any given occasion doesn’t feel unusual. The individual keeps going because, based on their history, the next attempt might still pay off. This is the same principle that makes slot machines so compelling: the intermittent, unpredictable payoff creates behavior that is extremely difficult to extinguish.
What Happens in the Brain During Extinction
Extinction learning involves two key brain regions working in tandem. The amygdala, which processes threat and emotional significance, is active during both the original learning and the early stages of extinction. It’s registering that the expected outcome isn’t happening. The prefrontal cortex, specifically a region behind the lower forehead, becomes important for storing and expressing the extinction memory over time. This region appears to be critical for retaining what was learned during extinction and suppressing the old response during later encounters.
This architecture explains why extinction is suppression rather than erasure. The original memory still lives in the amygdala-centered circuit. The extinction memory, housed partly in prefrontal regions, inhibits it. When conditions change (new context, passage of time, re-exposure to the original reinforcer), that inhibition can weaken, and the old response comes back.
Extinction in Therapy
Exposure therapy, one of the most effective treatments for anxiety disorders, phobias, and OCD, is built directly on extinction principles. The basic structure is straightforward: the person repeatedly confronts the thing they fear in the absence of the catastrophic outcome they expect. Someone with a spider phobia sits near a spider and nothing terrible happens. Someone with social anxiety gives a presentation and isn’t ridiculed. Over repeated sessions, the fear response weakens.
Under the extinction framework, fear reduction happens because a negative expectation is repeatedly proven wrong through direct experience. The person isn’t unlearning the fear so much as building a new memory that competes with it. This is why exposure therapy sometimes requires “booster” sessions: because the fear memory still exists, it can partially return through spontaneous recovery or context changes, and additional extinction trials help maintain the gains.
The extinction model doesn’t explain everything about exposure therapy, though. Some conditions involve fears that can’t easily be tested against reality. In OCD, for instance, a person might fear that failing to perform a ritual will cause harm to a loved one in the distant future. There’s no way to definitively disconfirm that fear in a single session. Clinicians have found that exposure therapy still works in these cases, suggesting that other mechanisms, such as habituation (the natural decline in a fear response with repeated exposure) or changes in how fear memories are stored, also play a role.
Extinction in Everyday Parenting
Parents use extinction principles, often without knowing the term, whenever they decide to stop reacting to disruptive behavior. The core strategy is simple: if a behavior exists because it gets attention, removing that attention will cause the behavior to fade. A child banging on cabinets to get a reaction will eventually stop if the reaction never comes.
The challenge, as any parent knows, is surviving the extinction burst. The behavior will almost certainly intensify before it improves. Knowing this in advance makes it easier to stay consistent, which is the single most important factor. Inconsistency, giving in sometimes but not others, creates a partial reinforcement schedule, which makes the behavior significantly harder to extinguish later. The key is to hold steady unless the situation involves genuine safety concerns, and to recognize that the temporary escalation is actually a sign the process is working.