Eline Haijen

Eline C. H. M. Haijen is a clinical researcher specialising in empirical studies of psychedelic experiences and their therapeutic and behavioural correlates. Her work spans instrument development, prospective naturalistic cohorts and randomised clinical investigation, with a particular focus on microdosing, low‑dose LSD, and the psychological mechanisms that underlie therapeutic change. Haijen has been centrally involved in validating the Emotional Breakthrough Inventory, a psychometric tool designed to quantify acute experiential shifts that predict clinical and wellbeing outcomes, and in prospective studies aimed at predicting individual responses to psychedelic use.

Her recent research portfolio includes naturalistic and comparative studies of psychedelic microdosing versus conventional ADHD medication on emotion regulation, empathy and ADHD symptoms, investigations into how psychedelics alter nature relatedness in a state‑dependent manner, and a randomized clinical trial assessing the safety and efficacy of repeated low‑dose LSD for adults with ADHD. Across these projects she emphasises rigorous, reproducible methods—combining psychometrics, longitudinal designs and clinical trials—to clarify mechanisms of action and to inform clinical translation of psychedelic interventions.