The signal is the individual: Why psychedelic science requires precision, intensive neuroimaging

Psychedelic neuroscience faces a fundamental problem: psychedelic experiences are profoundly personal and idiosyncratic, yet dominant neuroimaging analyses rely on spatial normalization and group averaging that implicitly assume shared functional anatomy. We argue that this mismatch leads to systematic mischaracterization of psychedelic effects at both global and local scales, and requires a focus on prioritizing signal fidelity and repeated within-individual measurement over sample size alone. 

In this joint presentation, we synthesize evidence from two recent intensive (precision) neuroimaging programs across complementary levels of description, and showcase what we have learned applying this intensive approach to neuroimaging in the psychedelics field. One dataset examines changes in large-scale network topology under psychedelics, while the other leverages ultra–high-field (7T) measurements to characterize local circuit-level computations within individual participants’ functional topographies. Across both datasets, deep within-subject sampling reveals robust neurophysiological effects that are stable within individuals but poorly aligned across subjects.

Crucially, identical data yield qualitatively different conclusions depending on whether analyses are conducted in group-normalized or atlas-based region-of-interest space versus in individual-native functional coordinates. Effects that appear weak, spatially diffuse, or disorganized at the group level instead reflect systematic, topography-specific reconfigurations unique to each brain. These effects are diluted or lost entirely by standard normalization procedures.

By integrating network-level insights from large-scale control architecture with fine-grained individual topographic modeling, we demonstrate that psychedelics act on conserved computational principles expressed in individual-level neural substrates. Intensive, individual-native analyses are therefore a prerequisite for successfully linking neural mechanisms to subjective psychedelic experience, and its therapeutic relevance.