Bit · Behavioral
Defense Mechanisms — Mature vs Immature
Eighteen ego defense mechanisms. NBME asks the name of one. They split into three maturity tiers.
Mechanism
Defense mechanisms are unconscious psychological strategies that manage anxiety, internal conflict, or unacceptable impulses. They are classified by maturity:
- Mature — adaptive, generally healthy.
- Neurotic (intermediate) — common in non-pathological adults but can become maladaptive.
- Immature — present in younger children, but pathological if persistent in adults.
Differentiator Table
| Tier | Mechanism | Definition / example |
|---|---|---|
| Mature | Sublimation | Channelling unacceptable impulse into socially acceptable form (e.g., aggression into competitive sport) |
| Mature | Humor | Coping with stress via comedy |
| Mature | Suppression | Conscious decision to put off thinking about something distressing |
| Mature | Altruism | Service to others as a way to manage own anxiety |
| Neurotic | Repression | Unconscious blocking of unacceptable thought/feeling |
| Neurotic | Displacement | Redirecting feelings from original target to a safer one (yelling at spouse after bad day at work) |
| Neurotic | Reaction formation | Acting in a way opposite to one's true feelings (excessive kindness toward someone you secretly resent) |
| Neurotic | Intellectualisation | Focusing on facts/logic to avoid emotional pain (cancer patient discussing only treatment statistics) |
| Neurotic | Rationalisation | Offering a reasonable-sounding but false explanation for behaviour |
| Neurotic | Isolation of affect | Separating feelings from facts (describing trauma without emotion) |
| Neurotic | Undoing | Performing an action to symbolically negate a previous one |
| Immature | Denial | Refusing to accept reality (recently diagnosed cancer patient who keeps making 5-year plans without acknowledging diagnosis) |
| Immature | Projection | Attributing one's own feelings to someone else |
| Immature | Acting out | Expressing unacceptable feeling/thought through actions instead of words |
| Immature | Regression | Reverting to childlike behaviour under stress (adult bedwetting after stress) |
| Immature | Splitting | Viewing people as all good or all bad (classic in borderline personality disorder) |
| Immature | Passive aggression | Indirectly expressing anger (procrastination, sullenness) |
| Immature | Identification | Adopting characteristics of someone admired or feared |
The Pivot
NBME questions present a vignette and ask which mechanism. Pattern match:
- Surgeon's son becomes a surgeon = identification.
- Cancer patient explains tumor stage without affect = intellectualisation.
- Husband blames his own infidelity on his wife = projection.
- Patient is 'always polite' to a doctor they secretly dislike = reaction formation.
- Therapist is 'angel' one session, 'devil' the next = splitting.
- 4-year-old starts bedwetting after a sibling is born = regression.
- Aggressive impulses channelled into boxing = sublimation.
NBME-Style Stem
A 28-year-old man whose father died from alcoholism becomes a substance use counsellor and dedicates his career to treating young men with addiction. Which of the following ego defense mechanisms best describes his behaviour?
Concept Anchor
Each defense mechanism is one specific cognitive maneuver to avoid an unacceptable feeling — the exam tests the name. Pattern matching the vignette to one of the 18 is the entire skill.