Comprehensive profiling of brain dynamics during anesthesia across phylogeny.

Summary

This study assembled multiscale neural recordings from six species and extracted more than 6,000 time-series features to define a conserved neural signature of anesthesia. Across species, anesthesia shortened intrinsic neural timescales and reduced inter-regional synchrony, producing spatiotemporal isolation of local activity; centromedian thalamic stimulation in macaques reversed this profile and restored behavioral responsiveness.

Key Findings

• A conserved anesthetic dynamical profile was identified across humans, macaques, marmosets, mice, zebrafish and nematodes.
• Anesthesia shortened intrinsic neural timescales and dampened inter-regional synchrony, consistent with spatiotemporal isolation of local neural activity.
• Deep-brain stimulation of the macaque centromedian thalamus reversed the anesthetic dynamical profile and restored behavioral responsiveness.

Clinical Implications

The findings may support development of neurophysiological biomarkers for anesthetic depth and recovery, and they provide a rationale for testing targeted thalamic or network-level stimulation in disorders of consciousness and delayed emergence. Clinical translation remains investigational because the stimulation evidence was demonstrated in macaques rather than patients.

Limitations

• The abstract does not establish that all anesthetic agents produce identical dynamics or that the findings apply uniformly across anesthetic states.
• Causal restoration of responsiveness by stimulation was demonstrated in macaques, limiting immediate human clinical generalizability.

Future Directions

Future studies should test whether the conserved dynamical signature predicts anesthetic depth, emergence, delirium or disorders of consciousness in patients, and should define the stimulation parameters and neural circuits that can safely reverse maladaptive anesthetic states.