Anesthesia Is 180 Years Old And Still a Mystery. A Study of 6 Animal Brains May Have Found Its Common Thread.

Key Points:

• A new study published in Nature Neuroscience reveals that general anesthesia disrupts consciousness by causing a breakdown in coordinated neural activity across different species, from humans to nematodes.
• Researchers led by Andrea Luppi at the University of Oxford analyzed brain activity in six species using fMRI and calcium imaging, finding consistent patterns of reduced coordination and increased chaos in neural signals under anesthesia.
• The study suggests a universal mechanism where anesthesia isolates local neural circuits, preventing them from sustaining and integrating information over time and space, rather than simply "turning off" the brain.
• These findings highlight an evolutionarily conserved process affecting consciousness, potentially advancing our understanding of animal consciousness as well as human anesthesia.
• The research supports the idea that the neural effects of anesthesia are shared across 700 million years of evolution, indicating a fundamental biological response to these drugs.