Defense Mechanisms In Psychology Explained (+ Examples)

Defense mechanisms are unconscious psychological strategies used to protect the individual from anxiety arising from unacceptable thoughts or feelings.

According to Freudian theory, these mechanisms involve a distortion of reality, allowing the mind to better cope with internal conflict or external stressors.

Function and Development

While defense mechanisms are a natural and normal part of human psychology, they can become maladaptive if used excessively.

• Healthy Use: They provide temporary relief, allowing the Ego (the mind’s rational, reality-oriented part of personality) to process information at a manageable pace.

• Overuse: When used with high frequency or intensity, they can lead to the development of neuroses, such as chronic anxiety states, phobias, obsessions, or hysteria.

Historical Origins

The concept was pioneered by Sigmund Freud (1894, 1896). He described “defence” as the ego’s turning away from an intolerable idea.

Freud used “defence” as the general name for these protective techniques. “Repression” was the one method his early work knew best.

His daughter, Anna Freud (1936), gathered her father’s scattered observations into a formal set in The Ego and the Mechanisms of Defence.

She counted nine familiar clinical methods. Then she added sublimation as a tenth: the one defense of normal, not neurotic, life.

Anna Freud also proposed a developmental order. Defenses like regression are among the earliest the ego uses.

Repression and sublimation, by contrast, could not appear until relatively late in development. Since then, contemporary psychoanalysts have continued to refine and test these ideas.

1. Denial

Denial is a defense mechanism, first identified by Anna Freud, in which a person refuses to accept reality. It blocks external events from awareness altogether.

When a situation feels like too much to handle, the person may simply refuse to perceive it, or deny that it exists at all.

This is a primitive and risky defense. No one can ignore reality forever and get away with it.

Denial rarely works alone. More often it operates alongside other, subtler mechanisms that prop it up. Even so, there is a limit to how much denial a person can use before it becomes obvious.

What is an example of denial?

• Relationship Infidelity: A spouse may ignore physical evidence, unexplained absences, or direct warnings about their partner’s unfaithfulness to avoid the pain of a broken marriage.
• Health Neglect: An individual might ignore a persistent, painful symptom (like a lump or chronic chest pain), refusing to see a doctor because acknowledging the symptom would mean acknowledging a potential illness.
• Intellectualization (High IQ): Instead of simply denying a painful fact, a highly intelligent person may use complex logic to explain it away. By turning an emotional crisis into a cold, abstract debate or a theoretical problem, they make their denial look like “rational thinking” to themselves and others.

2. Repression

Repression is a psychological defense mechanism where the mind pushes distressing thoughts, memories, or impulses out of conscious awareness.

Because these elements remain active in the unconscious mind, they continue to influence behavior and emotions even when the individual is unaware of their origin.

Anna Freud called repression “motivated forgetting”.

This process is driven by the Ego to protect the individual from overwhelming anxiety.

Repression typically targets thoughts that would trigger intense guilt from the Superego or those that stem from socially unacceptable desires within the Id.

Repression is rarely a successful long-term strategy.

Because the disturbing ideas are merely hidden rather than resolved, they remain psychically active, often manifesting as unexplained chronic anxiety or physical symptoms.

How repressed content surfaces

Since repressed material is never truly gone, it often bypasses the mind’s internal censors in altered, symbolic forms:

• Dreams: Where “latent” (hidden) desires appear as “manifest” (visual) symbols.

• Freudian Slips: Accidental slips of the tongue that reveal a hidden thought.

• Phobias: An unexplained fear that may be a displaced version of a repressed trauma.

What is an example of repression?

Oedipus Complex: aggressive thoughts about the same sex parents are repressed and pushed down into the unconscious.

Trauma: The mind “walls off” severe events, such as abuse, accidents, or disasters, to maintain daily functioning. Because the memory is blocked automatically rather than by choice, it remains entirely inaccessible to the conscious mind.

• The Event: A child witnesses a violent crime accompanied by the sound of sirens.

• The Repression: The visual and narrative memory of the crime is pushed into the unconscious.

• The Symptom: As an adult, the sound of a siren triggers a “fight or flight” response (panic, sweating, racing heart). The person feels the affect (the emotion) without the content (the memory).

Distinction Note: Repression vs. Denial

It is important to distinguish repression from denial.

• Denial involves refusing to accept the reality of external sensory data (e.g., refusing to believe a doctor’s diagnosis).
• Repression involves blocking inner states, such as thoughts, impulses, and memories

3. Projection

Projection is a psychological defense mechanism, proposed by Anna Freud, in which a person attributes their own unwanted thoughts, feelings, and motives to someone else.

It protects self-esteem by externalizing an undesirable part of the self. The forbidden feeling stays real. It just belongs to someone else now.

Anna Freud also called this displacement outward, almost the mirror image of turning aggression against the self.

What is an example of projection?

Thoughts most commonly projected onto another are the ones that would cause guilt such as aggressive and sexual fantasies or thoughts.

For instance, you might hate someone, but your superego tells you that such hatred is unacceptable. 

You can ‘solve’ the problem by believing that they hate you.

4. Displacement

Displacement is the redirection of an impulse, usually aggression, onto a powerless substitute target.

The target can be a person, or an object, serving as a symbolic stand-in.

Displacement occurs when the id wants to do something the superego forbids.

The ego finds another way to release that energy. It lands on a safer, more acceptable object.

Turning against the self is one special form of displacement, in which the person becomes their own substitute target.

It usually involves hatred, anger, or aggression rather than positive feelings.

Freud used it to explain many feelings of inferiority, guilt, and depression.

Not everyone agrees on the mechanism.

But many people, Freudian or not, accept the underlying idea: depression is often anger turned inward and left unacknowledged.

What is an example of displacement?

Someone who feels uncomfortable with their sexual desire for a real person may substitute a fetish.

Someone who is frustrated by his or her superiors may go home and kick the dog, beat up a family member, or engage in cross-burnings.

5. Regression

Regression is a defense mechanism proposed by Anna Freud whereby the the ego reverts to an earlier stage of development usually in response to stressful situations.

Regression functions as a form of retreat, enabling a person to psychologically go back in time to a period when the person felt safer.

What is an example of regression?

When we are troubled or frightened, our behaviors often become more childish or primitive.

A child may begin to suck their thumb again or wet the bed when they need to spend some time in the hospital. 

Teenagers may giggle uncontrollably when introduced into a social situation involving the opposite sex.

6. Sublimation

Sublimation is similar to displacement, but takes place when we manage to displace our unacceptable emotions into behaviors which are constructive and socially acceptable, rather than destructive activities.

Sublimation is one of Anna Freud’s original defense mechanisms.

For Freud, sublimation was the cornerstone of civilized life: arts and science, he argued, are all sublimated sexuality. This is a value-laden idea, rooted in the aspirations of European society at the end of the 1800s.

What is an example of sublimation?

Many great artists and musicians led unhappy lives. They channeled that pain into art or music instead. Sport works the same way, turning aggression into something constructive.

Sublimation can also be developmental. Fixation at the oral stage may later surface as oral pleasure-seeking, such as thumb-sucking, chewing a pen, or smoking. Fixation at the anal stage may surface instead as an adult enjoyment of pottery.

7. Rationalization

Rationalization is a defense mechanism, proposed by Anna Freud, that distorts “the facts” to make an event or an impulse feel less threatening.

Ordinary excuse-making shades into it. We all do this consciously sometimes.

But for people with sensitive egos, making excuses comes so easily that they never notice they are doing it. They are quite prepared to believe their own lies.

What is an example of rationalization?

When a person finds a situation difficult to accept, they will make up a logical reason why it has happened.

For example, a person may explain a natural disaster as “God’s will”.

8. Reaction Formation

Reaction formation, which Anna Freud called “believing the opposite,” is a psychological defense mechanism. A person goes beyond denial and behaves in the opposite way to how they actually think or feel.

Conscious behavior overcompensates for the anxiety of an unacceptable unconscious thought or feeling. The tell is its exaggerated, showy, or compulsive quality.

By using it, the id is satisfied while the ego stays ignorant of the true motive. Therapists often see this in patients who insist strongly on a belief and grow angry at anyone who disagrees.

What is an example of reaction formation?

Freud claimed that some men who are prejudiced against homosexuals are defending against their own homosexual feelings. Adopting a harsh anti-homosexual attitude helps convince them of their own heterosexuality.

Another example is the “dutiful daughter.” She lavishes love on her mother, but may really be reacting against an unconscious Oedipal hostility toward her.

9. Introjection

Introjection, sometimes called identification, involves taking into your own personality characteristics of someone else, because doing so solves some emotional difficulty.

Introjection is very important to Freudian theory as the mechanism by which we develop our superegos.

What is an example of introjection?

A child who is left alone frequently, may in some way try to become “mom” in order to lessen his or her fears.

You can sometimes catch them telling their dolls or animals not to be afraid.

And we find the older child or teenager imitating his or her favorite star, musician, or sports hero in an effort to establish an identity.

10. Identification with the Aggressor

Identification with the aggressor is a defense mechanism.

Sándor Ferenczi proposed it. Anna Freud developed it further.

It involves the victim adopting the behavior of a person who is more powerful and hostile towards them.

By identifying with the aggressor, the victim shifts from a passive, frightened role into an active one. Becoming like the feared figure partly disarms the threat; it does not, as such, make the aggressor feel empathy.

What is an example of identification with the aggressor?

Identification with the aggressor is a version of introjection focused on adopting a negative or feared trait, not a general or positive one.

Becoming more like a feared person is one way to partly conquer the fear of them.

In its most extreme form this appears as Stockholm Syndrome, where hostages bond emotionally with their captors and adopt their behavior.

The much-cited case is Patty Hearst. Abused by her captors, she joined their Symbionese Liberation Army and took part in a bank robbery. She was later acquitted, on the grounds that she was suffering from Stockholm Syndrome.

How Do Defense Mechanisms Work?

Defense mechanisms function as unconscious psychological strategies employed by the ego to manage anxiety and maintain self-image. They operate by distorting reality to prevent threatening thoughts, impulses, or memories from entering conscious awareness.

Id, Ego, and Superego

To understand how defense mechanisms work, one must look at the structural model of personality proposed by Sigmund Freud.

Personality is viewed as a conflict between three interacting systems:

• The Id: The unconscious, primitive part of the personality that contains instinctual drives for hunger, sex, and aggression. It operates on the “pleasure principle,” seeking immediate gratification.
• The Superego: The internal moral compass or conscience, developed through social interactions, which judges behavior and strives for perfection,.
• The Ego: The rational part of the personality that operates on the “reality principle.” Its job is to balance the impulsive demands of the id with the moralistic constraints of the superego within the context of the real world.

How Conflict Triggers Defenses:

When the ego cannot reconcile the opposing demands of the id and the superego, anxiety results.

To protect itself, the ego resorts to defense mechanisms. These distort reality so a person can keep functioning day to day, without unpleasant feelings or traumatic memories taking over conscious awareness.

Everyone uses these mechanisms to some extent. Overuse, though, can become problematic and lead to neuroses or other psychological disorders.

How does the ego decide which defense mechanism to use?

We don’t consciously pick a defense mechanism; our brain selects one based on our age, the situation, and our history.

Here is how that selection process works:

1. The “Maturity” Level

The psychiatrist George Vaillant (1977) ranked defenses into this kind of hierarchy after following men in the Harvard Grant Study across decades.

He found that defense maturity predicts psychological and physical health better than social class or childhood circumstances. As we grow and learn, we typically move from primitive reactions toward mature strategies.

Type	How it works	Real-world Example
Immature	Reflex-like reactions often seen in children or people under extreme stress.	Denial: Ignoring a doctor’s diagnosis because it’s too scary to face.
Neurotic	Shifting or “tricking” your emotions to make them more tolerable.	Displacement: Snapping at your spouse because you had a bad day at work.
Mature	Productive, healthy ways to handle stress without ignoring reality.	Sublimation: Going for a long run to burn off anger instead of starting an argument.

2. The Type of Threat (How You See the Problem)

The way you “size up” a threat changes how you react to it.

• Internal Threats: Your self-esteem might feel hurt. You might lash out at others through projection, to protect your ego.

• External Threats: A crisis, like a natural disaster, changes things. You are likely to seek help and use communal coping.

• Control: If you feel helpless, you might use emotion-focused defenses like denial. If you feel you can fix the problem, you are more likely to use active, problem-solving strategies.

3. Habits and Past Learning

Like any other skill, your mind “learns” what works.

• Reinforcement: If you successfully avoided a scary situation as a child by pretending it wasn’t happening, your brain remembers that “win.”

• Habitual Patterns: Over time, these successful escapes become your “default settings.” You develop a signature “coping style” that triggers automatically when things get tough.

Critical Evaluation

Defense mechanism theory has generated real scientific debate. Critics question whether the idea can be tested at all. A large body of research has tried to test it anyway.

The Falsifiability Problem

The classic objection is that defense mechanisms are unfalsifiable. On the philosopher Karl Popper’s criterion, a claim that can never be proven wrong is not scientific.

Reaction formation is the textbook example. A person’s behavior can go either way. A psychoanalyst can then argue the unconscious wish showed itself directly, or that it came out as its opposite. No single observation can settle the question.

The deeper problem is definitional. Because defenses are unconscious by definition, no one can observe one operating directly. Telling a genuine defense from ordinary coping is hard.

Still, treating reaction formation as typical of the whole theory is a mistake. Psychoanalysis is better read as a collection of separate hypotheses that vary in testability.

Early Experimental Evidence

Contrary to the “untestable” verdict, defense mechanisms generated a large experimental literature well before the 2000s.

Baumeister, Dale and Sommer (1998) re-examined seven Freudian defenses against modern social-psychology findings. These included reaction formation, projection, displacement, and denial.

Several held up in modified form. Others fit the evidence poorly.

Projection received particular attention. Holmes (1978) reviewed the older evidence skeptically.

Newman, Duff and Baumeister (1997) later offered a cognitive alternative. Suppressing an unwanted trait, they showed, makes that trait chronically accessible in the mind. A person then over-perceives that same trait in others.

This gave “defensive projection” a testable, laboratory-supported explanation.

Paulhus, Fridhandler and Hayes (1997) reviewed this earlier theory-and-research field more broadly, finding a genuine mixed record: some defenses replicated, others did not.

Neuroscience and Repression

Repression carries special weight in this debate. As Kline (1989) put it, “if no evidence could be found for repression, this would alter considerably the nature of psychoanalysis.” That is a high bar. Supporting evidence here matters more than it would for a peripheral claim.

Case studies of anosognosia, a denial of paralysis following right-hemisphere brain damage, offer indirect support. Ramachandran (2011) described a paralyzed patient who briefly acknowledged her paralysis after vestibular stimulation.

The effect was brief. Once it wore off, she reverted to believing her arm was normal. She also forgot admitting, minutes earlier, that it was paralyzed at all. The episode reads like repression compressed into a single afternoon.

Neuroimaging work on deliberate memory suppression tells a similar story. It appears to be a real, measurable brain process, not merely a psychoanalytic myth (Wickelgren, 2012; Berlin & Koch, 2009).

Contemporary Research

Two recent strands of work update, rather than overturn, the classical picture.

Cramer’s (2015) forty-year research program scores projective story-telling tests for defensive content. It continues to find the developmental pattern Anna Freud predicted. Denial-type defenses decline with age; more complex defenses increase.

Di Giuseppe and Perry (2021) turned a clinician-rated defense scale into a self-sort version. This gave the maturity hierarchy a quantitative, validated measure. Vaillant himself first proposed it decades earlier, on clinical grounds alone.

Aim: Di Giuseppe et al. (2024) modeled defense mechanisms as an interconnected system, rather than a simple ranked list, to find which individual defenses matter most clinically.

Method: 655 Italian adults with high depression and anxiety symptoms, during the first COVID-19 lockdown, completed a 30-item self-report measure of 16 defenses.

They also completed standard depression and anxiety scales. The defenses were analyzed as a network, not as independent scores.

Results: The 16 defenses formed a single interconnected network. Self-assertion, a mature defense, was the most central node.

It linked positively to other mature defenses and negatively to immature ones.

Mature defenses like humor and sublimation correlated with fewer symptoms. Immature defenses correlated with more.

Conclusion: This is the first demonstration that defensive functioning behaves as an interconnected system, the authors argue.

Targeting central defenses like self-assertion may work better than treating each mechanism alone.

It is a single large survey, not a randomized trial. It was also gathered under the unusual conditions of a pandemic lockdown. So it confirms Vaillant’s original claim; it does not prove it.

Cultural and Gender Bias

The maturity hierarchy carries cultural assumptions. What counts as a “mature” defense, such as individual sublimation or self-reliant humor, reflects Western, individualist values.

Behavior read as immature in one culture may be normal and adaptive in another.

Early psychoanalytic accounts also tied specific defenses to gender. Identification with the aggressor was linked to boys resolving the Oedipus complex; a parallel process, anaclitic identification, was linked to girls and the Electra complex.

Later work has treated these gendered claims with considerable caution.

Modern measurement research has begun testing whether defense profiles, and their links to health, hold up across cultures and genders. So far, the cross-cultural evidence base remains thinner than the evidence for the underlying idea that everyone uses defenses.

Key Takeaways

References

Baumeister, R. F., Dale, K., & Sommer, K. L. (1998). Freudian defense mechanisms and empirical findings in modern social psychology: Reaction formation, projection, displacement, undoing, isolation, sublimation, and denial. Journal of Personality, 66(6), 1081-1124.

Berlin, H. A., & Koch, C. (2009). Neuroscience meets psychoanalysis. Scientific American Mind, 20(2), 16-19.

Cramer, P. (2015). Defense mechanisms: 40 years of empirical research. Journal of Personality Assessment, 97(2), 114-122.

Di Giuseppe, M., Lo Buglio, G., Cerasti, E., Boldrini, T., Conversano, C., Lingiardi, V., & Tanzilli, A. (2024). Defense mechanisms in individuals with depressive and anxiety symptoms: A network analysis. Frontiers in Psychology, 15, 1465164. https://doi.org/10.3389/fpsyg.2024.1465164

Di Giuseppe, M., & Perry, J. C. (2021). The hierarchy of defense mechanisms: Assessing defensive functioning with the defense mechanisms rating scales Q-sort. Frontiers in psychology, 12, 718440.

Ferenczi, S. (1933). Confusion of tongues between adults and the child (pp. 156-67).

Freud, A. (1937). The Ego and the mechanisms of defense, London: Hogarth Press and Institute of Psycho-Analysis.

Freud, S. (1894). The neuro-psychoses of defence. SE, 3: 41-61.

Freud, S. (1896). Further remarks on the neuro-psychoses of defense. SE, 3: 157-185.

Freud, S. (1933). New introductory lectures on psychoanalysis. London: Hogarth Press and Institute of Psycho-Analysis. Pp. xi + 240.

Freud, S. (1936). Inhibitions, symptoms and anxiety. The Psychoanalytic Quarterly, 5(1), 1-28.

Holmes, D. S. (1978). Projection as a defense mechanism. Psychological Bulletin, 85(4), 677.

Kline, P. (1989). Objective tests of Freud’s theories. In A. M. Colman & J. G. Beaumont (Eds.), Psychology survey 7. British Psychological Society / Routledge.

Liberman, A., & Chaiken, S. (1992). Defensive processing of personally relevant health messages. Personality and Social Psychology Bulletin, 18(6), 669-679.

Newman, L. S., Duff, K. J., & Baumeister, R. F. (1997). A new look at defensive projection: Thought suppression, accessibility, and biased person perception. Journal of personality and social psychology, 72(5), 980.

Paulhus, D. L., Fridhandler, B., & Hayes, S. (1997). Psychological defense: Contemporary theory and research. In R. Hogan, J. A. Johnson, & S. R. Briggs (Eds.), Handbook of personality psychology (pp. 543-579). http://dx.doi.org/10.1016/B978-012134645-4/50023-8

Ramachandran, V. S. (2011). The tell-tale brain: A neuroscientist’s quest for what makes us human. W. W. Norton.

Vaillant, G. E. (1977). Adaptation to life. Little, Brown.

Wickelgren, I. (2012). Trying to forget. Scientific American Mind, 22(6), 32-39.

Further Reading

• Name the Defense Mechanism Activity
• BPS Article on Repression
• Cramer, P. (2015). Understanding defense mechanisms. Psychodynamic Psychiatry, 43(4), 523-552.
• Freudian Defense Mechanisms and Empirical Findings in Modern Social Psychology: Reaction Formation, Projection, Displacement, Undoing, Isolation, Sublimation, and Denial
• Defense Mechanisms Summary Table
• Suppression
• Repression vs. Suppression