About

Grounded in science. Informed by evolution.

Nāhua Fieldnotes is about psychedelic therapy and the deeper question underneath it. What actually has to happen for a person to change, and stay changed?

Much of the psychedelic conversation falls into two familiar camps. One is vaguely spiritual and allergic to evidence. The other is so clinical it misses the point, as if the molecule were the whole story. Both skip what matters most after the trip is over: whether the opening becomes a different way to live.

These essays examine all sides of that gap. They are rigorous about mechanism, allergic to spiritual bypass, and unwilling to pretend the science is settled where it isn't.

The central claim is simple. A psychedelic may open a window. It does not do the work that happens inside it. Preparation, context, the people in the room, and what comes after determine whether the window becomes change, or just another powerful experience.

The lens is evolutionary and neurobiological. Why a nervous system that worked for most of human history now misfires in the conditions we built. What the research can support, where it breaks down, and which claims are running ahead of the evidence. The writing assumes you're smart, skeptical, and tired of being sold to.

Some pieces stand alone. Others build into longer arguments, including the Signal Loss Model, a framework for why modern life quietly degrades the signals a healthy mind depends on. If you're new, Start Here lays out a few paths through the work depending on what brought you.

Who writes this

Brian Gleason. Fieldnotes migrated to its own domain in May 2026 and is written and run by one person with a standing commitment to ignore the hype and follow the evidence. Brian founded the Nāhua group of companies in 2023.