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Reply to 'Methodological concerns and interpretative limitations of assessing subjective effects of ketamine'
Jack D C Dahan1, David Dadiomov2,3, Tijmen Bostoen4,5
1Location Academic Medical Center (AMC), Amsterdam University Medical Center, Amsterdam, the Netherlands.
Npj Mental Health Research
|September 22, 2026
Abstract:
This response addresses methodological concerns raised regarding our meta-analysis of subjective effects and therapeutic outcomes following ketamine and psilocybin treatment. We discuss the potential influence of psychotherapy and differences in subjective-effect questionnaires across studies, acknowledging these as important limitations. We argue that these factors may partly explain observed treatment differences and highlight the need for future studies using standardized, multidimensional measures of subjective experience.