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Fear Conditioning

Fear conditioning is a psychological process where a neutral stimulus, when paired with an aversive stimulus, triggers a fear response, serving as a foundational concept in understanding how fear and anxiety develop. Let’s delve into the mechanisms of fear conditioning, its significance in human psychology, various examples from both experimental and real-world settings, and the types of fear responses it can elicit. We will also explore the underlying brain structures, methods for mitigating conditioned fear, and the intricacies of fear extinction. Through examining fear conditioning’s role in survival and its potential for causing psychological disorders, we get a comprehensive overview of how fear is learned, expressed, and can be addressed through interventions.

little albert experiment fear conditioning

What is fear conditioning?

Fear conditioning is a specific form of classical conditioning. In fear conditioning, associative learning forms when a neutral stimulus becomes associated with an aversive stimulus, leading to a fear response to the previously neutral stimulus alone. 

Here is how fear conditioning, also known as Pavlovian fear conditioning or classical conditioning of fear, is acquired.

  • Danger or aversive event: Aversive stimulus (unconditioned stimulus, US)
  • Harmless object: Neutral stimulus (NS) and conditioned stimulus (CS)
  • Acquisition: The object was present when danger appeared 
  • Association: The object becomes conditioned. Seeing the object alone can trigger a conditioned fear response (conditioned response, CR)

What are the types of fear conditioning?

There are two types of fear conditioning.​1​

  • Contextual fear conditioning: In this type of fear conditioning, the conditioned stimulus is not an object but a context. Context is a set of circumstances surrounding an event, such as a location or setting. Context can also be relationships between spatial and temporal aspects, internal states like hunger or stress, cognitive factors like how information is processed and recalled, social dynamics, and cultural​​ backgrounds. A fear response is triggered when the conditioned person is placed back into the same environment.
  • Cued fear conditioning: In this type of fear conditioning, the conditioned stimulus is a discrete, identifiable stimulus, such as a brief signal or light.

Why is fear conditioning important?

Fear conditioning plays an important role in creating fear and anxiety in humans. Fear learning is crucial for survival, enabling an individual to predict and avoid danger based on previous experiences.

Although meant to be a survival mechanism, fear conditioning can create problems when the acquired fear responses cannot be extinguished when there’s no longer a threat or when it leads to maladaptive behavior. Excessive or pathological fear can contribute to the development of mental disorders, including generalized anxiety disorder, panic disorder, phobias, post-traumatic stress disorder (PTSD), and obsessive-compulsive disorder (OCD).

Individuals may learn to fear situations or stimuli that are not inherently dangerous, leading to excessive worry and avoidance, impairing daily functioning and quality of life.  The conditioned memory of traumatic events can cause debilitating fear responses for decades after the danger has passed.

What are some examples of fear conditioning?

Here are 10 examples of fear conditioning, illustrating how this process can occur in a controlled experimental setting and real-life situations:

  • Lab experiment with rats: A classic example involves pairing a neutral stimulus, like a tone, with an electric shock. After several pairings, rats begin to freeze (a fear response) when they hear the tone alone, anticipating the shock.
  • Child and loud noises: A child who experiences a loud, startling noise (unconditioned stimulus) while playing with a specific toy (neutral stimulus) may later exhibit fear responses (crying, avoidance) just by seeing the toy, which has become a conditioned stimulus.
  • Fear of dogs: Someone who a dog bites (unconditioned stimulus) may later feel anxious or fearful (conditioned response) at the sight or sound of any dog (conditioned stimulus), not just the one that bit them even long after the conditioned fear of dogs.
  • Phobia of heights: A phobia is an example of fear conditioning. A person who has a traumatic fall (unconditioned stimulus) may later develop a classical conditioning phobia of heights (conditioned response), even in safe situations where height is involved (conditioned stimulus).
  • Anxiety about examinations: A student who experiences significant stress and adverse outcomes (unconditioned stimulus) during a particular exam may develop an anticipatory fear of exams in general (conditioned stimulus), leading to test anxiety (conditioned response).
  • Fear of driving: After being involved in a car accident (unconditioned stimulus), an individual might become anxious or fearful (conditioned response) at the thought of being in a car (conditioned stimulus), even if they are not driving.
  • Social anxiety: Experiencing embarrassment or criticism in social situations (unconditioned stimulus) can lead to a fear of social interactions (conditioned response), where social settings become a conditioned stimulus.
  • Fear of specific sounds: Soldiers exposed to the sound of gunfire or explosions (unconditioned stimulus) in combat may later feel anxious or exhibit a stress response (conditioned response) to similar loud noises, like fireworks (conditioned stimulus), even in a safe environment.
  • Food aversion: After suffering from food poisoning (unconditioned stimulus) due to eating a specific food, a person may develop a lasting aversion (conditioned response) to that food (conditioned stimulus), feeling nauseous or anxious at its sight or smell.
  • Trauma-related fears: Victims of traumatic events (unconditioned stimulus) may develop fears associated with stimuli present during the trauma (conditioned stimuli), such as a fear of certain locations, objects, smells, or sounds, even if those stimuli are not inherently harmful.

What are fear examples?

Fear encompasses a psychological experience and physiological response to a perceived or anticipated threat. Fear is a natural and essential human emotion that helps us survive. 

Fear is subjective. What one person perceives as a threat may not have the same impact on another person.

Here are 5 common types and examples of fear.

  • Natural environment: Phenomena such as height, storm, lightning, and loud noise.
  • Animal: Specific animals such as snakes, bears, or spiders
  • Bodily harm related: Injury related such as needles, blood, or injections
  • Social interaction: Engaging with others, like public speaking, going to events, or meeting new people
  • Situational: Specific situations like enclosed spaces, driving, or public speaking

What are fear response examples?

There are generally 4 types of fear responses. Here are some examples.

  • Physiological responses: Increased heart rate, rapid breathing, sweating, muscle tension, dilated pupils, digestive changes, dry mouth, and fight-flight-or-freeze response.
  • Emotional responses: Fear, panic, anxiety, and helplessness.
  • Cognitive responses: Heightened alertness, negative or catastrophic thoughts, and difficulty concentrating.
  • Behavioral responses: Screaming, seeking help, and avoidance.

Is fear learned?

Fear can be learned or innate. Fear is a fundamental emotion arising from perceived threat or danger. When a threat is detected, the innate fear arises and, at the same time, creates a learning process leading to the memorization of the fearful event, according to a 2016 study published in Learning & Memory. Therefore, fear can be an unconditioned and conditioned response.​2​

What is the Little Albert Experiment?

The Little Albert Experiment is a renowned fear conditioning study by psychologist John Watson and his student, Rosalie Rayner, at Johns Hopkins University in 1920. The study was published under “Conditioned Emotional Reactions” in the Journal of Experimental Psychology.

A baby named “Little Albert” was initially not afraid of rats. To condition a fear response, Watson repeatedly paired the presentation of the rat (neutral stimulus) with a loud, jarring noise produced by striking a hammer against a suspended steel bar (unconditioned stimulus). Each time the rat was shown and the loud noise was made, Little Albert was startled and cried (unconditioned response).

After multiple pairings, Little Albert showed a conditioned fear response of crying and avoidance upon seeing the rat, even without the loud noise. The rat had become a conditioned stimulus that provoked a conditioned emotional response of fear, such as falling over, crying, and crawling away from the rat.​3​

Note: This cruel experiment would not be acceptable by current ethical standards.

What is the fear conditioning paradigm?

The fear conditioning paradigm is a widely used experimental framework for studying how fear responses are acquired, expressed, and extinguished in animals and humans. This paradigm typically involves three main phases.

  • Pre-Conditioning (Baseline Assessment): Before conditioning begins, the response to the neutral stimulus (which will become the conditioned stimulus or CS) is measured without any association to the aversive stimulus (unconditioned stimulus, or US) to establish a baseline of behavior or physiological response.
  • Acquisition (Conditioning): In this phase, the previously neutral stimulus is paired with the aversive stimulus, forming an association between the two. As a result, the neutral stimulus becomes a conditioned stimulus that elicits a conditioned response similar to the unconditioned response elicited by the aversive stimulus.
  • Extinction: This phase involves presenting the conditioned stimulus without the aversive stimulus, gradually decreasing the conditioned response.

The fear conditioning paradigm has become a widely used paradigm to study the acquisition, extinction, and return of fear since the study of the Little Albert Experiment was published. 

What part of the brain is involved in fear conditioning?

Fear conditioning is a complex process involving multiple brain regions, but the amygdala plays a particularly crucial role in acquiring and expressing fear responses. A 2009 study published in PloS one highlights that the amygdala, insula, and anterior cingulate cortex form a critical neural circuit involved in fear conditioning. Depending on the conditioning context, additional regions such as the hippocampus, prefrontal cortex, and sensory processing areas also play vital roles.​4​

How to remove fear conditioning

Fear conditioning can be weakened through fear extinction. Here are some methods used to implement fear extinction.

  • Exposure: Repeatedly exposing the person to the fear-eliciting stimulus without the aversive stimulus to weaken the fear association and diminish the fear response. Examples include exposure therapy and virtual reality (VR) therapy.
  • Counterconditioning: Teaching the individual a new response to the conditioned stimulus incompatible with fear. For example, by pairing a pleasing stimulus with a conditioned stimulus, the person can associate relaxation or positive emotional responses with the feared stimulus, replacing the fear response.
  • Cognitive restructuring: Identifying and challenging negative thoughts and beliefs associated with the feared cue and replacing them with more realistic and positive interpretations.
  • Cognitive Behavioral Therapy (CBT): This comprehensive therapy combines exposure, counterconditioning, and cognitive restructuring to help individuals understand and manage their fears.
  • Systematic Desensitization: Teaching the individual relaxation techniques and then gradually exposing them to the fear-inducing stimulus, from the least fearful scenario to more direct exposures, while practicing these relaxation techniques to manage anxiety.
  • Mindfulness and Acceptance: Mindfulness-based stress reduction (MBSR) and acceptance and commitment therapy (ACT) focus on observing fear responses without judgment and committing to actions that align with personal values despite the presence of fear.
  • Disrupting Reconsolidation – When recalled, conditioned fears can be disrupted through retrieval-extinction training before they solidify again.
  • Changing Context – Conditioned fears are often stronger in the context in which they were acquired. Changing the context can weaken the fear memory.
  • Pharmacotherapy: In some cases, medication might be prescribed to reduce anxiety symptoms and facilitate the extinction process, especially when combined with therapies like exposure therapy. These can include SSRIs (selective serotonin reuptake inhibitors) or beta-blockers, which can help manage physiological symptoms of fear.

The information provided here is based on current scientific knowledge, but the mental health field is constantly evolving. New research and treatment options may emerge over time.

The abovementioned treatments of fear conditioning are intended for informational purposes only and should not be construed as medical advice. Self-treatment attempts without proper supervision can be risky and potentially worsen existing symptoms. Always consult with a mental health professional before initiating any treatment for fear conditioning or anxiety disorders.

If you are struggling with fear conditioning or an anxiety disorder, please reach out to a qualified mental health professional for help. They are here to support you on your journey to overcoming your fears and living a fulfilling life.

Can fear extinction undo fear conditioning?

Extinction is not the same as unlearning, forgetting, or undoing fear conditioning, according to a 2004 study published in Neuron.​5​

Researchers found that fear extinction does not remove the fear memory but instead creates a new memory that pairs the feared stimulus with the absence of the unconditioned stimulus. This new memory becomes an associated learning of fear inhibition.​6​

Is it possible to establish fear conditioning with a single pairing of a neutral and harmful stimulus?

Yes, it is possible to establish fear conditioning with a single pairing of a neutral and harmful stimulus. This tends to happen if the harmful stimulus involves a life-threatening element or if the individual finds the stimulus traumatizing.


  1. 1.
    Curzon P, Rustay NR, Browman KE. Cued and contextual fear conditioning for rodents. In: Methods of Behavior Analysis in Neuroscience. 2nd ed. NCBI; 2009:.
  2. 2.
    Silva BA, Gross CT, Gräff J. The neural circuits of innate fear: detection, integration, action, and memorization. Learn Mem. Published online September 15, 2016:544-555. doi:10.1101/lm.042812.116
  3. 3.
    Watson JB, Rayner R. Conditioned emotional reactions. Journal of Experimental Psychology. Published online 1920:1-14. doi:10.1037/h0069608
  4. 4.
    Sehlmeyer C, Schöning S, Zwitserlood P, et al. Human Fear Conditioning and Extinction in Neuroimaging: A Systematic Review. Gendelman HE, ed. PLoS ONE. Published online June 10, 2009:e5865. doi:10.1371/journal.pone.0005865
  5. 5.
    Phelps EA, Delgado MR, Nearing KI, LeDoux JE. Extinction Learning in Humans. Neuron. Published online September 2004:897-905. doi:10.1016/j.neuron.2004.08.042
  6. 6.
    Izquierdo I, Furini CRG, Myskiw JC. Fear Memory. Physiological Reviews. Published online April 2016:695-750. doi:10.1152/physrev.00018.2015


    * All information on is for educational purposes only. Parenting For Brain does not provide medical advice. If you suspect medical problems or need professional advice, please consult a physician. *