Cross-validation of the ego dissolution scale: implications for studying psychedelics.

Area of Science:

• Psychology
• Psychopharmacology

Background:

• Ego dissolution, or ego loss, is a key feature of psychedelic experiences.
• The Ego Dissolution Scale (EDS) was developed to assess this phenomenon in non-psychedelic contexts.
• Cross-validation is essential to confirm the scale's psychometric properties and utility.

Purpose of the Study:

• To cross-validate the 10-item Ego Dissolution Scale (EDS).
• To assess the reliability and construct validity of the EDS in a general population.
• To explore the relationship between ego dissolution and other psychological variables.

Main Methods:

• A sample of 527 undergraduate college students completed the EDS and other psychological measures online.
• Confirmatory factor analysis was used to replicate the two-factor structure (Ego-Loss and Unity/connectedness).
• Reliability was assessed using Cronbach's alpha, and convergent validity was examined using various psychological variables.

Main Results:

• The two-factor structure of the EDS was replicated.
• The total score and subfactors demonstrated adequate-to-good reliability (Cronbach's α range: 0.78–0.83).
• The EDS showed strong convergent validity with measures of mindfulness, affect, and dissociation, but not with neuroticism or social desirability.

Conclusions:

• The EDS is a reliable and valid measure for assessing ego dissolution in everyday life.
• The scale's findings suggest distinct patterns of association for the Ego-Loss and Unity subfactors.
• The EDS is valuable for studying everyday ego dissolution, long-term psychedelic effects, and acute psychedelic responses.