If you were involved in a tragic car accident and afterwards couldn't stop sucking your thumb, this would be an example of

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Quizplus · Accepted Answer

Regression refers to reverting back to an earlier stage of development in response to stress or trauma. Sucking of thumb is a behavior commonly observed in infants and young children, therefore, if an adult were to start doing this after a traumatic event, it would be an example of regression. Fixation refers to becoming stuck at a particular stage of psychosexual development, libido refers to the overall energy or drive of the sexual instinct, and arrest refers to the interruption of development at a certain stage.

If You Were Involved in a Tragic Car Accident and Afterwards