Speech markers of psychedelic-induced psychological change
Joanna Kuć, Rosalind G. McAlpine, Amelia Sellers, George Blackburne, Daniel R. Lametti, Jeremy I Skipper
bioRxiv April 21, 2025 preprint DOI: 10.1101/2025.04.16.649217
Summary
AI-generated from the abstractAfter a single 12 mg dose of the psychedelic 5-MeO-DMT, people's speech patterns shifted toward more cognitive language and fewer social words, and their voices showed increased jitter and shimmer, indicating altered vocal quality. Baseline speech features predicted how psychologically prepared participants were, their anxiety about ego dissolution, emotional breakthrough, and later well-being. The findings suggest that analyzing voice journals can track a shift from external focus to introspection and serve as a tool for monitoring psychological transformation after psychedelic use.
Study at a glance
| Characteristics | Longitudinal observational study |
|---|---|
| Sample size | 29 |
| Population | Adults participating in a 5-MeO-DMT retreat |
| Intervention | 5-MeO-DMT |
| Dose | 1×12 mg |
| Duration | Two weeks before and two weeks after the 5-MeO-DMT session |
| Keywords | Psychedelics Mental health Linguistics Cognitive science Communication patterns |
| Key finding | Speech markers shifted toward increased cognitive language and decreased social words, and voice quality changed, with baseline features predicting psychological outcomes after 5-MeO-DMT. |
Abstract
Abstract 5-MeO-DMT, a potent, short-acting psychedelic, induces profound shifts in cognition, affect, and self-awareness. Because language explicitly expresses these domains and voice implicitly conveys them, both may serve as potential ‘biomarkers’ of behavioural change. This study introduces a novel framework for analysing baseline language and vocal features, pre- to post-psychedelic changes, assessing their potential to predict subjective experiences and psychological outcomes. Daily voice journals from 29 participants were collected via ‘RetreatBot’ for two weeks before and after 5-MeO-DMT (1×12 mg). Transcripts were analysed using NLP (bag-of-words for vocabulary; transformer model for textual affect), and acoustic features (e.g., pitch, jitter, shimmer) were extracted to assess vocal dynamics. Following 5-MeO-DMT, speech markers revealed increased cognitive language, decreased social words, and altered voice quality (increased jitter/shimmer). Baseline speech patterns predicted psychological preparedness, ego dissolution anxiety, emotional breakthrough, and post-experience well-being. This first longitudinal analysis of speech markers following psychedelic use demonstrates a shift from external focus to introspection. Speech markers predicted and tracked psychological transformation, establishing vocal journaling as a valuable framework for monitoring psychedelic-induced changes and facilitating integration.