Which defense mechanism might be illustrated by an adult engaging in thumb-sucking to feel secure?

• A. Regression
• B. Repression
• C. Sublimation
• D. Undoing

Answer: (A)

Regression is when an adult copes with anxiety by reverting to behaviors from an earlier developmental stage. Thumb-sucking provides a soothing, familiar source of comfort from childhood, offering security in a stressful moment. This isn’t about hiding thoughts (repression), nor about redirecting energy into a new, constructive outlet (sublimation), nor about trying to negate an action (undoing); it’s about returning to a previous coping pattern to feel safe.