← The Observable Unknown
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Welcome back to the observable unknown. Tonight we turn inward, not to the mind in our skull, but to the intelligence of our inner ecology. We often speak of gut feelings as metaphor. But what if they are literal? What if intuition, mood, even belief arise not only from neurons, but from microbes, tiny unseen citizens shaping what it means to be you? Let us now explore how the visceral neural dialogue links emotion to digestion, translating chemistry into feeling. Because the story of the gut brain axis is not simply biology. It is a revolution in what we mean by mind. The human body houses roughly 100 trillion microorganisms, a vast community living primarily in the intestines. Collectively, this microbiome weighs nearly as much as the brain itself and speaks to it through an ancient line of communication, the vagus nerve, the wandering thread that connects the viscera to the mind. The German anatomist Johann Neuhauser first described the vagus nerve in the 18th century. But only now do we grasp its role as an information superhighway, carrying signals about hunger, emotion, and sometimes safety. Every minute, messages travel upward from gut to brain 10 times more than from brain to gut. The body does not simply obey the mind, it instructs it. Gastroenterologist EMran Meyer of UCLA calls this system the second brain. He and his colleagues showed that gut bacteria produce neuroactive chemicals serotonin, dopamine and gamma aminoputyric acid, previously thought unique to neurons. In 2015, Meyer demonstrated that altering gut flora in mice changed not only stress behavior, but also brain structure in regions tied to emotion and memory. The observable unknown. Here, cognition itself may be co authored by organisms that never think, but instead help us to. At Caltech, Sarkis Mezmanyan uncovered how gut bacteria influence autism related behaviors. His team found that a single bacterium, Bacteroides fragilis, restored social behavior in mouse models of neurodevelopmental disorder. The mechanism chemical whispers across the gut lining, modulating the immune and nervous systems simultaneously. Masmanian calls this microbial symphony the observable unknown. Emotion may begin not in thought, but in ecology. In Ireland, John Cryan and Ted Dinan coined the term psychobiotics live organisms that can alter mood through the microbiome. Their studies at University College Cork revealed that certain strains of Lactobacillus and Bifidobacterium reduce anxiety and depression in both animals and humans. These bacteria modulate gamma aminobutyric acid receptor expression. They shift cortisol levels and even change the way the amygdala responds to threats. Kryon once said, the mind is not only embodied, it is imbacteried. The observable unknown well, being itself might be a form of ecological balance. Recent work by Christopher Lowry and Kathryn Hoban suggest that our microbial symbionts directly imprint our long term emotional patterns, what many researchers now refer to as microbial memory. The gut remembers stress, transmits that memory through immune signaling and primes the brain for either erosive vigilance or reparative calm. In this way, experience occurs binarily. Learning becomes digestion, history becomes habitat. So the gut and brain are not separate organs but interlocutors in constant negotiation, each shaping the other through chemical language. Short chain fatty acids tune inflammation, vagal afferents translate microbial chatter into emotion. Neurotransmitters echo through both systems. The Observable unknown Here, consciousness may be distributed, not a spark in the skull, but a dialogue between trillions of living voices within. And so the next time you feel a gut instinct, pause before dismissing it as simply primitive. That quiet knowing may be the chorus of ancient life, bacteria, nerves and cells composing meaning together. The visceral mind does not merely digest the world it interprets. Interprets it. Before we close, remember, you can join this conversation by sending me feedback directly. Visit our WhatsApp channel, the Observable Unknown. Email me at theobservableunknownmail.com or text me personally at 336-675-5836 and wherever you listen to this podcast, please leave a review and a rating. Your words help others find our journey into the unseen. Because every dialogue, like every microbiome, is alive only through connection. I want to thank you for walking with me into the observable unknown.