repression, in psychoanalytic theory, the exclusion of distressing memories, thoughts, or feelings from the conscious mind. Often involving sexual or aggressive urges or painful childhood memories, these unwanted mental contents are pushed into the unconscious mind.

The Brain's Response to Trauma

According to a 2006 study by NIH, trauma mainly affects three important parts of your brain: the amygdala, which is your emotional and instinctual center; the hippocampus, which controls memory; and the prefrontal cortex, which is responsible for regulating your emotions and impulses.