Why Belief Calms the Animal Brain
I went to see Blindboy Boatclub speak at Leisureland. That was the plan: a local pilgrimage, a familiar performance, Galway doing Galway. But as part of the evening, Blindboy brought on behavioral neuroscientist Dr. Michael Keane, and the conversation took an unexpected turn into the machinery of the mind.
For readers new to The Agentic Foma, a little context. The book borrows the word foma from Cat’s Cradle - harmless untruths, or necessary fictions, that help human beings make sense of reality. In our use, foma are the stories, beliefs, and frameworks we inherit or construct in order to navigate a world that is far stranger, more complex, and less knowable than we would like to admit. Nations are foma. Money is foma. Identity is foma. Even the self may be a kind of foma. The project of The Agentic Foma is not to destroy these stories, but to see them clearly - and to choose them consciously.
What emerged that night was not a contradiction of that framework. It was something deeper: a basement floor we had not fully excavated.
One of Keane’s central points was simple but profound: the thinking part of the brain - the prefrontal cortex - provides context for the older, faster parts of the brain, especially the amygdala and the broader limbic system. The primitive system reacts first. The thinking system explains second. That sequence matters. It means the nervous system is already moving before the story begins.
This sharpens something at the center of The Agentic Foma. We have argued that belief systems are inoculations against mystery. But neuroscience suggests they are something even more fundamental: inoculations against nervous-system dysregulation. The amygdala does not care about truth. It cares about danger. It scans constantly: Am I safe? What is happening? What should I do? Fast, ancient, efficient - and deeply intolerant of uncertainty.
The prefrontal cortex arrives afterward and provides context. And what better context than belief? Religion says there is a plan. Politics says there is a cause. Nationalism says there is a people. Markets say there is a system. Conspiracy says there is an explanation. Each of these reduces uncertainty. Not necessarily by increasing truth, but by reducing ambiguity.
That may be the hidden function of foma: not merely stories about reality, but regulatory technologies for surviving it.
This changes the model. Before language, there is alarm. Before ideology, there is physiology. The nervous system detects threat; the mind supplies story. Foma is often the story that makes the threat bearable.
That helps explain why belief systems are so durable, and why challenging them is often so difficult. When you challenge someone’s belief, you are often not challenging an idea. You are destabilizing a regulation system. The body hears danger.
This also explains why political and religious arguments escalate so quickly. The stakes are not merely intellectual. They are biological. Certainty is not just an idea; it is a sedative. It keeps the animal calm.
Keane also described belief, ritual, and disciplined frameworks as prefrontal strengthening exercises - ways of improving top-down regulation over the limbic system. That is a useful distinction, because it complicates the easy critique of belief. Not all belief is sedation. Some belief is training. Meditation, prayer, philosophy, therapy, even disciplined reflection can strengthen the capacity to remain present with uncertainty without collapsing into fear.
But there is a darker side to this. If belief regulates action, it can also regulate extreme action. A sufficiently powerful belief system can reduce hesitation, doubt, and moral friction. History gives us the darkest example. The Holocaust was not merely industrialized murder. It was industrialized certainty: a totalizing belief system so coherent, so socially reinforced, that ordinary people could participate in extraordinary evil while remaining psychologically regulated.
Calm.
That may be the most dangerous nervous system of all: not the anxious one, but the calm one inside a closed belief system.
The danger is not emotion. The danger is regulated certainty in service of a rigid story.
This may be the deepest distinction in the age of AI - not between belief and unbelief, but between closed certainty and regulated openness.
The goal is not to eliminate foma. That may be impossible.
The goal is to choose foma that increase your capacity to face reality, not hide from it.
Because perhaps the real work of agency is not the elimination of illusion.
It is learning how to remain calm enough in the face of uncertainty that you do not need certainty at all.