Learning Objectives
Master the classification of Ego Defense Mechanisms. Distinguish between the 16 Immature Defenses and the 4 Mature Defenses, understand the specific psychological triggers for each, and identify high-yield clinical examples commonly tested on the USMLE Step 1.
1. Mature Defense Mechanisms
Mature defenses are healthy and adaptive ways to resolve conflict. A helpful mnemonic to remember these is “Mature adults wear a SASH.”
| Defense | Description | Example |
|---|---|---|
| Sublimation | Replacing an unacceptable wish with a socially acceptable course of action (vs. reaction formation). | A teenager’s aggression toward parents is channeled into excelling in sports. |
| Altruism | Alleviating negative feelings via unsolicited generosity, providing gratification (vs. reaction formation). | A mafia boss makes a large donation to charity. |
| Suppression | Intentionally withholding an idea or feeling from conscious awareness (vs. repression); temporary. | An athlete focuses on other tasks to prevent worrying about an upcoming match. |
| Humor | Lightheartedly expressing uncomfortable feelings to shift focus away from distress. | A nervous medical student jokes about the boards. |
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2. Immature Defense Mechanisms: Complete Reference
Immature defenses are largely subconscious and are used to manage internal conflict by taking action without reflection, avoiding reality, or using logic to distance oneself from emotion.
| Defense | Description | Example |
|---|---|---|
| Acting Out | Subconsciously coping with stressors using actions rather than reflection. | A patient skips therapy sessions to avoid dealing with painful past memories. |
| Denial | Avoiding the awareness of a painful reality. | A cancer patient plans a full-time work schedule despite warnings of fatigue. |
| Displacement | Redirection of impulses to a neutral person or object (vs. projection). | A teacher reprimanded by her principal criticizes her wife’s cooking. |
| Dissociation | Temporary, drastic change in personality/memory to avoid stress. | An abuse survivor sees the abuser and suddenly becomes numb and detached. |
| Fixation | Partially remaining at a more childish level of development (vs. regression). | A college student continues to suck her thumb when studying for exams. |
| Idealization | Expressing extremely positive thoughts of others while ignoring flaws. | A patient boasts about his physician’s brilliance while ignoring any mistakes. |
| Identification | Unconscious assumption of the characteristics/traits of another. | A resident starts wearing a stethoscope in her pocket like her favorite attending. |
| Intellectualization | Using facts and logic to emotionally distance oneself from stress. | A cancer patient discusses pathophysiology instead of feelings. |
| Isolation (of Affect) | Separating feelings from ideas and events. | Describing a murder in graphic detail with no emotional response. |
| Passive Aggression | Demonstrating hostile feelings in a nonconfrontational, indirect manner. | A disgruntled employee is repeatedly late to work to spite a manager. |
| Projection | Attributing an unacceptable internal impulse to an external source. | A man who wants to cheat on his wife accuses her of being unfaithful. |
| Rationalization | Asserting plausible explanations for events to avoid self-blame. | A fired employee claims the job was not important anyway. |
| Reaction Formation | Replacing a warded-off feeling with an emphasis on its opposite. | A stepfather treats a child he resents with excessive nurturing. |
| Regression | Involuntarily turning back the clock to earlier developmental behaviors. | A toilet-trained child begins bedwetting after a sibling is born. |
| Repression | Involuntarily withholding an idea or feeling from awareness. | A 20-year-old does not remember counseling from 10 years ago. |
| Splitting | Believing people are “all good” or “all bad” due to intolerance of ambiguity. | A patient says nurses are cold but physicians are warm (common in Borderline PD). |
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High-Yield Mnemonics & Tips:
- “S” for Suppression: Think Suppression = Stop! (A conscious choice).
- “P” for Projection: Think Projection = Point the finger at someone else for your own feelings.
- Repression vs. Suppression: Remember, Repression is immature because it is Involuntary.
- Splitting: Hallmark of Borderline Personality Disorder. “Borders split countries.”