Defense mechanisms and personality in depression.

Area of Science:

• Psychiatry and Clinical Psychology
• Personality Disorders and Traits
• Treatment of Mood Disorders

Background:

• Traditional views posit personality stability, but Axis I disorders and their treatments may influence personality assessment.
• An alternative framework defines personality through defense mechanisms and personality organization, distinct from phenomenological systems.
• This study investigates the stability of these dynamic character traits during treatment for major depressive disorder (MDD).

Purpose of the Study:

• To test the hypothesis that defense mechanisms and personality organization are stable in patients treated for MDD, regardless of treatment response.
• To determine if defense mechanisms or personality organization predict treatment response or dropout rates in MDD.
• To explore enduring personality characteristics independent of Axis I disorder status.

Main Methods:

• Patients with major depressive disorder (MDD) enrolled in randomized controlled medication trials.
• Defensive functioning assessed using the Defense Style Questionnaire (DSQ).
• Personality organization evaluated with the Inventory of Personality Organization (IPO) at baseline and post-treatment.

Main Results:

• Baseline 'image-distorting' defenses were more prevalent in drop-outs than responders.
• A significant decrease in 'maladaptive' defenses was observed post-treatment across the sample and in responders.
• Medication responders exhibited less 'maladaptive' defenses and healthier 'overall defensive functioning' compared to non-responders post-treatment.

Conclusions:

• Defense mechanisms and personality organization appear relatively stable during MDD treatment, suggesting enduring personality traits.
• While maladaptive defenses may decrease with treatment, core personality structures remain consistent.
• Specific defense patterns may predict treatment outcomes, highlighting their clinical relevance.