Final answer:
Defense mechanisms are unconscious behaviors used by the ego to reduce anxiety, including reaction formation, regression, displacement, and sublimation, as per Freud's psychoanalytic theory.
Step-by-step explanation:
Milton's personality disorder and corresponding defense mechanism are not specified in the question, however, the concept described pertains to Sigmund Freud's theory on anxiety and defense mechanisms. Defense mechanisms are unconscious protective behaviors that work to reduce anxiety which the ego employs when there is a conflict between one's id (primitive urges) and superego (moral standards). One example of such a defense mechanism is reaction formation, where a person expresses the opposite of their unconscious wishes or feelings due to anxiety. Another example is regression, where an individual reverts to behavior from an earlier stage of development. Other mechanisms include displacement and sublimation, where inappropriate urges are redirected towards more acceptable targets or activities, respectively.