Factors influencing quality of processing in EMDR therapy

Area of Science:

• Psychology
• Psychotherapy
• Trauma Studies

Background:

• EMDR (Eye Movement Desensitization and Reprocessing) therapy is a complex process involving memory reprocessing.
• Challenges in processing during EMDR can impact treatment outcomes, particularly for individuals with complex early traumatization.
• Existing instruments may not fully capture the nuances of processing difficulties encountered in EMDR therapy.

Purpose of the Study:

• To introduce and validate a new instrument, the Processing Difficulties Scale (PDS), for assessing problems during memory reprocessing in EMDR therapy.
• To explore the psychometric properties of the PDS, including its factorial structure, internal consistency, and validity.
• To investigate the relationship between processing difficulties, early trauma, dissociation, and emotional dysregulation in the context of EMDR therapy.

Main Methods:

• Development of the 17-item Processing Difficulties Scale (PDS) based on expert clinical input.
• Exploratory and confirmatory factor analyses to determine the scale's structure (four-factor solution).
• Assessment of internal consistency (Cronbach's alpha, Omega index) and convergent/discriminant validity using measures like the SCL-90, ACE, DERS, and DES.

Main Results:

• The PDS demonstrated a robust four-factor structure explaining 55% of the variance, with good model fit indices.
• The scale exhibited high internal consistency (Cronbach's alpha > 0.82, Omega > 0.83 for factors; > 0.90 for total scale).
• Preliminary analyses indicated that dissociation correlates with loss of dual attention, while early trauma events correlate with attention deficits. Emotional dysregulation did not predict processing difficulties.

Conclusions:

• The Processing Difficulties Scale (PDS) is a psychometrically sound instrument for evaluating processing challenges in EMDR therapy.
• The findings highlight the role of dissociation and early trauma in specific processing difficulties, particularly loss of dual attention.
• The PDS can inform clinical practice by identifying processing issues and potentially guiding tailored interventions in Phase 2 of EMDR therapy for complex trauma.