Key Takeaway
Meta-analysis confirmed eye movements during memory recall reduce emotional intensity, supporting the working memory theory of EMDR's mechanism.
Summary
This meta-analysis examined laboratory studies testing whether eye movements - the core component of EMDR therapy - actually reduce the emotional intensity of negative memories.
The working memory theory proposes that simultaneously holding a memory in mind while making eye movements taxes working memory, which degrades the vividness and emotionality of the memory.
Results from 26 studies confirmed that eye movements significantly reduce both vividness and emotional intensity of negative memories compared to control conditions, providing mechanistic support for EMDR's effectiveness.
Methods
- Meta-analysis of 26 laboratory studies
- Controlled experiments with negative memory recall
- Eye movements vs eyes stationary or other conditions
- Outcomes: memory vividness and emotionality ratings
Key Results
- Significant reduction in vividness (d = 0.72)
- Significant reduction in emotionality (d = 0.50)
- Effects robust across study designs
- Supports working memory taxing hypothesis
Limitations
- Laboratory studies vs clinical populations
- Mostly autobiographical memories, not trauma
- Short-term effects measured
- Exact mechanism still debated