Related Experiment Video
Updated: Aug 16, 2026
09:18
A Gut-on-a-Chip Model to Study the Gut Microbiome-Nervous System Axis
Published on: July 28, 2023
Microbial neuroscience: The gut microbiota as a cognitive layer
1Department of Psychiatry, University of Oxford, Oxford OX3 7JX, UK.
Trends Open
|August 15, 2026
Summary
The gut microbiota may play a functional role in cognition, acting as an information-processing layer influencing cognitive states through memory-like persistence and feedback with the brain. This research proposes a distributed model of cognition involving the gut-brain axis.
Area of Science:
- Neuroscience
- Microbiology
- Cognitive Science
Background:
- Cognition is traditionally viewed as solely brain-centered.
- Gut microbes are often considered mere modulators of physiology and behavior.
- Emerging research indicates microbial communities possess adaptive and interactive capabilities with neural systems.
Purpose of the Study:
- To propose a distributed model of cognition.
- To reframe the gut microbiota as a functional contributor to cognitive processes.
- To outline experimental strategies for investigating microbiota-gut-brain interactions.
Main Methods:
- Integration of concepts from systems neuroscience, microbiology, and cognitive theory.
- Development of a theoretical framework for distributed cognition.
- Proposal of experimental approaches for causal investigation.
Main Results:
- The gut microbiota is proposed as an intermediate information-processing layer.
- Microbiota may influence cognitive states via memory-like persistence.
- Closed-loop feedback mechanisms between the gut microbiota and brain are suggested.
Conclusions:
- The gut microbiota may be a functional component of cognition, not just a modulator.
- A distributed cognition model incorporating the gut microbiota offers new research avenues.
- Further research is needed to establish causal links in behavior and decision-making.
Related Concept Videos
01:22Gut-Brain Axis
The gut–brain axis is a bidirectional communication system that connects the gastrointestinal tract and the brain. This interaction is mediated through multiple pathways, including the vagus nerve, hormonal signals, immune responses, and chemical messengers produced by gut microbes.Microbial Contributions to Brain FunctionGut microbiota contributes significantly to brain function by producing neuroactive compounds. These include neuroactive compounds that influence neurotransmitters such as...
01:18Functions of the Gut Microbiota
The gut microbiota includes trillions of microorganisms that colonize the human gastrointestinal tract, including bacteria, archaea, viruses, and fungi. This complex ecosystem plays a critical role in maintaining intestinal and systemic health. Most of these microbes inhabit the large intestine, establishing a relatively stable and diverse community that contributes to gut homeostasis through various metabolic, immunological, and protective mechanisms.Dominant bacterial phyla, such as...
01:22Introduction to the Human Microbiota
Microorganisms colonize various regions of the human body, including the mouth, nasal passages, throat, stomach, intestines, urogenital tract, and skin. The total number of microbial cells is estimated to range from 10¹³ to 10¹⁴—comparable to, or exceeding, the number of human somatic cells. This host–microbiome relationship has led to the conceptualization of humans as supraorganisms, wherein microbial communities perform vital roles in development, immunity, and disease...
01:21Microbiota Modulation by Antibiotics
Antibiotics have revolutionized modern medicine by saving countless lives from bacterial infections. However, their widespread use has inadvertently harmed the delicate balance of the human gut microbiota. The gut microbiota, a complex community of bacteria, archaea, viruses, and fungi, plays a vital role in regulating metabolism, immune responses, and maintaining intestinal health. Antibiotics, especially broad-spectrum types, disrupt this ecosystem by eradicating both harmful and beneficial...
01:18Dysbiosis of the Gut Microbiota
The human gut microbiome includes a diverse array of microbial species, including beneficial commensals and opportunistic pathogens, which interact to support host health. These microbes contribute to essential functions such as nutrient metabolism, immune system modulation, and maintenance of intestinal barrier integrity. However, disruptions to this equilibrium—referred to as dysbiosis—can have widespread physiological consequences.Dysbiosis is often characterized by reduced microbial...
01:27Microbiota of the Large Intestine
The large intestine hosts the most densely populated microbial ecosystem in the human body. This complex community primarily consists of anaerobic bacteria, with Bacillota (formerly Firmicutes) and Bacteroidota (formerly Bacteroidetes) as the predominant groups. The distribution of these microbes varies along different sections of the large intestine, influenced by local environmental factors such as oxygen availability and nutrient composition.The cecum, located at the beginning of the large...