Can placebos reduce intrusive memories?

Area of Science:

• Psychology
• Neuroscience
• Clinical Psychology

Background:

• Traumatic experiences can lead to intrusive memories and significant distress.
• Placebo interventions are increasingly explored for their therapeutic potential in managing psychological distress.

Purpose of the Study:

• To investigate the efficacy of open-label placebo (OLP) and deceptive placebo (DP) in reducing the frequency and severity of intrusive memories following trauma exposure.
• To examine the role of expectations in the emergence and impact of intrusive memories.

Main Methods:

• Healthy participants (N=112) were exposed to a trauma-film paradigm.
• Participants were assigned to either OLP, DP, or no treatment groups for one week.
• Intrusion frequency, intensity, distress, and appraisals were assessed, along with participant expectations.

Main Results:

• No significant difference in the frequency of intrusive memories was observed between OLP, DP, and no-treatment groups.
• Participants receiving OLP reported significantly lower intensity of intrusions compared to the DP group.
• Negative expectations were associated with higher intrusion frequency, distress, burden, and negative appraisal across all groups.

Conclusions:

• Placebo interventions, particularly OLP, can reduce the intensity of intrusive memories, suggesting a role for expectation in memory consolidation and recall.
• Participant expectations significantly modulate the experience of intrusive memories, highlighting their importance in psychological distress.
• Placebos offer a potentially accessible and cost-effective strategy for mitigating the impact of intrusive memories, with clinical implications for trauma recovery.