Reconsolidation-Based Intervention for Traumatic Memories

The goal of this clinical trial is to test the effect and underlying mechanism of reconsolidation-based cognitive reappraisal for traumatic memories in patients with major depression disorder. The main questions it aims to answer are: * Is cognitive reappraisal based on memory reconsolidation effective for laboratory-created traumatic memories? Which of the two classical cognitive reassessment schemes is more effective? * What is the neural mechanism by which the novel cognitive reappraisal based on memory reconsolidation alters traumatic memories? * Can repeated use of the novel cognitive reappraisal based on memory reconsolidation alter the actual childhood traumatic memories of patients with major depression disorder? Can it reduce depressive symptoms? Are the effects long-lasting? Participants will be grouped to receive the intervention (retrieval + cognitive reappraisal, non-retrieval + cognitive reappraisal). The researchers will compare the differences in long-term memory tests and the improvement in depressive symptoms between the two groups to see the effects of the memory-based reconsolidation intervention.