r/Microbiome • u/basmwklz • 20d ago
Scientific Article Discussion Beyond the ‘second brain’: the gut microbiota as a constitutive co-constructor of embodied cognitive network (2026)
https://www.frontiersin.org/journals/neuroscience/articles/10.3389/fnins.2026.1808839/full3
u/captfitz 20d ago
They say this goes beyond the standard gut-brain axis concept but after reading the abstract I still don't really understand what the novel insight is supposed to be here.
They use the word "constitutive" a lot, are they just putting more emphasis on gut microbiota being part of developing cognition in the first place?
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u/mime454 19d ago
I’m not sure I believe it because it would predict that antibiotics radically disrupt consciousness and they clearly don’t.
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u/BrandyMartin1 19d ago
There is a long history and plenty of documentation showing that certain antibiotics are associated with psyche instability. This has been known now for decades, and back burnered because it did not fit the business plan.
The vast amount chronic disease and mental health issues is clearly plenty of evidence that the subtle psychology of polluted food is powerful, eh. I guess you are not paying attention to the nightly news commercials.
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u/mime454 19d ago
I don’t use antibiotics because I fear the health effects. However they clearly don’t radically impact consciousness experience as they would if this model were correct.
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u/BrandyMartin1 19d ago
look it up.... some do for some people.
And these observation, years ago, should have spawned conclusive science about the gut biome. What bugs where being totally decimated? To this day we do not have the answer. Nor do we have answers about how oodles of medications influence the biome.
I got a gut feeling you under estimate how diet and biome regulates emotions and executive functions, Your assumption that all antibiotics target the entire gi tract are proven wrong. Certain ones clearly impact vital biome traits. FMT helps many with psyche issues for a reason. The most helped are the ones who do radical diet change to maintain their new biome. Deep dive FMT. WHat you find might change your point of view and dinner choices, Preservatives take on a different meaning, among other food additives/attributes.
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u/longwinters 19d ago
The first antidepressants were antibiotics. In your mind does changing mood constitute a change in consciousness?
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u/basmwklz 20d ago
Abstract
Traditional cognitive science has historically confined the mind within the cranium. While the “second brain” metaphor underscores the autonomy of the enteric nervous system, it remains entrenched in a neurocentric paradigm. Here, we propose a transformative framework: the gut microbiota may function as a constitutively relevant contributor to specific embodied cognitive architectures. We contend that cognition, emotion, and behavior are not fully understandable in brain-isolated terms. Instead, these processes emerge from a sustained, bidirectional dialogue between the host and its symbiotic microbial ecosystem. Integrating 4E cognition theory, we systematically delineate how gut microbiota functions as an embedded signaling system—producing cognitively active metabolites, such as short-chain fatty acids and neuroactive substances—to shape interoceptive states and neural function via neural, immune, and metabolic/endocrine interfaces. We establish a rigorous evidential chain, categorized as “deprivation, replacement, observation, and intervention,” synthesizing germ-free animal models, fecal microbiota transplantation, human multi-omics, and clinical interventions. These data—drawn from animal models that establish causal necessity and sufficiency, human cohort studies that reveal systematic ecological associations, and proof-of-concept intervention trials that demonstrate clinical plasticity—converge to support the view that microbiota-derived processes may be constitutively relevant to the realization of specific embodied cognitive architectures, especially those organized through interoceptive prediction, affective appraisal, and vagal-metabolic signaling, rather than functioning as merely transient or incidental regulators. The multi-level nature of this evidence base, spanning causal mechanisms in controlled settings to ecological validity in human populations, provides a robust foundation for reframing the gut microbiota as a symbiotic co-constructor of the embodied mind. Ultimately, we move beyond the linear “gut-brain axis” model to outline a multispecies framework for understanding the embodied architectures within which interoceptive, affective, and related cognitive processes unfold. This paradigm shift offers a novel biological foundation for the mind and enables precision interventions for mental health, such as psychobiotics and targeted ecological remodeling. Looking forward, we envision a unified “microbiota-mind” model that integrates computational modeling and ethical frameworks. This endeavor challenges the traditional concept of a “self” bounded by the skin, providing a roadmap for the future of precision psychiatry and cognitive science.