Regressive behavior (Hebethymia)

Regressive behavior (or cognition) in hebethymia is the regression or evolution of cognition and personality to be stuck in a childlike or teenage state for milder cases. For example, a child may grow up and become an adult but act and "think" like a teenager.

Symptoms

 * Behavioral regression.
 * Developmental or cognitive regression.
 * Reduced speech efficiency.
 * Reduced maturity of behavior.
 * Rocking back and forth or pacing.
 * Masturbation.
 * Whining or picking tantrums.
 * Acting out.
 * Thumb-sucking.
 * A positive could be that people with the condition can learn faster than others.