What is the name of the defense mechanism where an individual returns to a former behavior that is inappropriate or immature in response to stress?

The term that describes the defense mechanism where an individual reverts to earlier, often immature behaviors in response to stress is known as regression. This psychological defense mechanism can manifest in a variety of ways; for example, an adult may exhibit childlike behaviors during times of high stress or anxiety, such as throwing tantrums, seeking comfort items, or withdrawing from adult responsibilities.

Regression acts as a coping strategy, allowing individuals to manage overwhelming emotions or situations by reverting to more secure or familiar states, much like a child would. It reflects a temporary step back in emotional development as a method of handling external pressures or internal conflicts.

In contrast, repression involves unconsciously blocking out distressing thoughts or memories, denial entails refusing to accept reality or facts, and sublimation is the process of channeling unacceptable impulses into socially acceptable behaviors. These mechanisms differ significantly in their processes and effects on behavior.