LSD reconfigures cortical dynamics through faster brain rhythms and increased fractal dimension
Abstract
Lysergic acid diethylamide (LSD) profoundly alters conscious experience, yet the electrophysiological mechanisms by which it reshapes neural dynamics remain incompletely understood. A hallmark of psychedelic states is widespread cortical desynchronization, typically inferred from reductions in spectral power, but whether such effects reflect genuine weakening of neural oscillations or are confounded by shifts in oscillatory peak frequencies remains unresolved. We combine source-resolved magnetoencephalography (MEG), spectral parameterization, temporal complexity metrics, and interpretable machine learning in an LSD versus placebo design, with and without music. We show that LSD induces robust, spatially structured increases in alpha and beta peak frequencies alongside genuine attenuation of oscillatory power, with partly dissociable cortical patterns. Beyond rhythmic activity, LSD is associated with flattening of the aperiodic 1/f spectral slope and increased neural signal fractality and complexity, preferentially affecting sensory, language, emotion, and imagery-related networks while sparing motor cortex. Machine-learning analyses identify peak-frequency shifts, aperiodic parameters, and complexity measures as key discriminators of the psychedelic state. Music does not robustly amplify these neural signatures and instead shows a trend toward attenuation. These findings provide an electrophysiological account of how LSD reorganizes large-scale human brain dynamics and highlight features that may differentiate its neural signature from other psychedelics.
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BibTeX
@article{subramani2026reconfigures,
title = {{LSD reconfigures cortical dynamics through faster brain rhythms and increased fractal dimension}},
author = {Venkatesh Subramani and Timothy Nest and Annalisa Pascarella and Jérémy Brunel and Yorguin José Mantilla Ramos and Yann Harel and Suresh Muthukumaraswamy and Robin Carhart-Harris and Giulia Lioi and Nicolas Farrugia and Karim Jerbi},
journal = {Communications Biology},
year = {2026},
month = oct,
doi = {10.1038/s42003-026-10629-7},
url = {https://www.nature.com/articles/s42003-026-10629-7},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - LSD reconfigures cortical dynamics through faster brain rhythms and increased fractal dimension
AU - Venkatesh Subramani
AU - Timothy Nest
AU - Annalisa Pascarella
AU - Jérémy Brunel
AU - Yorguin José Mantilla Ramos
AU - Yann Harel
AU - Suresh Muthukumaraswamy
AU - Robin Carhart-Harris
AU - Giulia Lioi
AU - Nicolas Farrugia
AU - Karim Jerbi
PY - 2026
DA - 2026/10/07
JO - Communications Biology
DO - 10.1038/s42003-026-10629-7
UR - https://www.nature.com/articles/s42003-026-10629-7
AB - Lysergic acid diethylamide (LSD) profoundly alters conscious experience, yet the electrophysiological mechanisms by which it reshapes neural dynamics remain incompletely understood. A hallmark of psychedelic states is widespread cortical desynchronization, typically inferred from reductions in spectral power, but whether such effects reflect genuine weakening of neural oscillations or are confounded by shifts in oscillatory peak frequencies remains unresolved. We combine source-resolved magnetoencephalography (MEG), spectral parameterization, temporal complexity metrics, and interpretable machine learning in an LSD versus placebo design, with and without music. We show that LSD induces robust, spatially structured increases in alpha and beta peak frequencies alongside genuine attenuation of oscillatory power, with partly dissociable cortical patterns. Beyond rhythmic activity, LSD is associated with flattening of the aperiodic 1/f spectral slope and increased neural signal fractality and complexity, preferentially affecting sensory, language, emotion, and imagery-related networks while sparing motor cortex. Machine-learning analyses identify peak-frequency shifts, aperiodic parameters, and complexity measures as key discriminators of the psychedelic state. Music does not robustly amplify these neural signatures and instead shows a trend toward attenuation. These findings provide an electrophysiological account of how LSD reorganizes large-scale human brain dynamics and highlight features that may differentiate its neural signature from other psychedelics.
SN - 2399-3642
ER -