Acute Psychedelic Reactions, Post-Acute Changes in Dysfunctional Attitudes, and Psychedelic-Associated Changes in Wellbeing

The study used a retrospective, cross-sectional survey administered via Prolific to adults with prior psychedelic experience. Initial respondents numbered 587; participants were required to pass two attention checks. Demographic characteristics reported include 64.7% male, 85.7% White, 97.1% non-Hispanic/Latinx, and an age range of 18–77 (mean = 37.97, SD = 12.29). A total of 457 participants provided complete data and passed attention checks; the investigators identified and removed 13 outliers (nine univariate z-scores > |3.29| and four multivariate outliers by Mahalanobis distance), leaving an analytic sample reported after outlier removal. Respondents were instructed to recall and report on “their most meaningful or significant psychedelic experience.” Measures included: the short form WEMWBS to rate recalled mental wellbeing before and after the event; the 30-item Mystical Experience Questionnaire (MEQ); the Emotional Breakthrough Inventory (EBI, 6 items); the Challenging Experience Questionnaire (CEQ, 26 items); and a 9-item short form of the Dysfunctional Attitude Scale (DAS), administered for recalled attitudes before and after the experience (difference scores used). The CEQ scores were square-root transformed to reduce skew; DAS difference scores had univariate outliers removed to improve distribution. Internal consistency was assessed with McDonald’s Omega and reported as adequate. Analytically, the team focused on whether post-acute changes in dysfunctional attitudes accounted for unique variance in change in wellbeing beyond acute subjective measures. Primary analyses were multiple regression predicting change in wellbeing from DAS change, MEQ, EBI, and CEQ. To address multicollinearity and estimate relative importance, they also performed relative weights analysis and dominance analysis, computing all possible regression models to compare predictor contributions. Variance inflation factors were reported as <1.4. The investigators set a conservative focus on p-values ≤ .01 for key hypotheses. Missing data were minimal (no item >2% missing); no imputation was performed.

Demographics and data-cleaning steps were reported as above. Bivariate correlations showed a moderate positive correlation between change in dysfunctional attitudes and change in wellbeing (r = .496). Correlations between acute subjective measures and wellbeing were smaller: MEQ r = .243, EBI r = .300, and absolute-value CEQ r = .172. MEQ scores correlated positively with EBI and change in wellbeing and negatively with CEQ; MEQ and EBI increased with DAS change while CEQ did not. In the multiple regression predicting change in wellbeing from DAS change, MEQ, EBI, and CEQ, variance inflation factors were <1.4 indicating acceptable multicollinearity. Dysfunctional-attitude change accounted for significant unique variance in wellbeing change; emotional breakthroughs (EBI) and challenging experiences (CEQ) also contributed significant unique variance, whereas mystical experiences (MEQ) did not. Reported beta coefficients were: DAS 0.488, MEQ 0.030, EBI 0.236, and absolute CEQ 0.257. Wald tests indicated the beta for DAS significantly exceeded the betas for MEQ (chi-square = 36.4), EBI (chi-square = 10.50), and CEQ (chi-square = 7.17) at p < .01. Relative weights analysis rescaled contributions to the total explained variance and indicated that dysfunctional-attitude change contributed 8.66 times more than MEQ, 5.45 times more than CEQ, and 3.46 times more than EBI. The ordered ranking from relative weights was: DAS > EBI > CEQ > MEQ. Dominance analysis, which considered all possible predictor combinations, yielded an overall R-squared of 0.324 for the model and attributed 71.30% of that explained variance to DAS, 14.51% to EBI, 13.89% to CEQ, and 0.31% to MEQ. The authors also note suppressor effects: for example, CEQ alone explained ~3% of variance in wellbeing in bivariate analyses, but that increased to 7.6% when MEQ was included, suggesting interactions among predictors affect apparent effect sizes.

Earleywine and colleagues interpret the findings as evidence that post-acute reductions in dysfunctional attitudes are an important correlate of retrospective, psychedelic-associated increases in wellbeing and that these post-acute changes explain more variance in self-reported wellbeing change than most acute subjective measures. Nonetheless, acute reactions—particularly emotional breakthroughs and, to a lesser extent, challenging experiences—also contributed unique variance. Mystical experiences showed smaller unique effects in multivariate models, but including MEQ enhanced the predictive contribution of CEQ, indicating complex interrelations and some suppressor dynamics among subjective-experience measures. The researchers position these results as supporting a distinction between acute subjective effects and subsequent cognitive changes, arguing that multivariate techniques sensitive to multicollinearity (relative weights and dominance analysis) can clarify the relative importance of correlated predictors in PAT research. They suggest practical implications: targeting dysfunctional attitudes explicitly during preparation and integration—potentially via standard cognitive interventions—could be a feasible way to augment PAT outcomes. The authors also mention strategies to optimise acute reactions, such as improving set and setting, emotion-regulation training, or pharmacological adjuncts (e.g. MDMA) to reduce challenging experiences, while cautioning that priming for emotional breakthroughs might produce unrealistic expectations. Multiple limitations are acknowledged. The design is retrospective and correlational, relying on self-report and memory for both acute and pre/post attitudes, which limits causal inference. The sample lacked sociodemographic diversity and was drawn from an online platform, and the study was not preregistered. The authors note potential issues with experimenter demand, placebo-like non-specific effects (set, setting, social support), and the narrow focus on a single post-acute construct when other mechanisms (mindfulness, behavioural activation, psychological flexibility, connectedness) may also matter. Given these caveats, they call for longitudinal, preregistered clinical trials with diverse samples and richer measurement of post-acute mechanisms to determine whether dysfunctional-attitude change is a mechanism or correlate of psychedelic-associated improvements. The team views their findings as justification for integrating cognitive-targeted preparatory and integration work into future PAT research and practice.