Gut-Brain Axis Interactions and Neuropsychological Outcomes

The gut-brain axis constitutes a complex bidirectional network linking the gastrointestinal tract and the central nervous system through neural pathways, circulating metabolites, immune mediators and hormonal signals. Microbial communities inhabiting the gut produce short-chain fatty acids, neurotransmitter precursors (notably tryptophan derivatives) and a host of bioactive compounds that can modulate brain function, neuroinflammation and blood-brain barrier integrity. Conversely, central processes including stress responses and autonomic regulation shape gut motility, secretion and microbial ecology. Dysbiosis and increased intestinal permeability permit translocation of bacterial products, triggering systemic inflammation that may exacerbate mood disorders, cognitive decline and neurodegenerative pathologies. Epidemiological and interventional studies have linked dietary patterns, probiotic supplementation and pharmacological modulation of microbial metabolites to changes in anxiety, depression, memory performance and neurodevelopmental trajectories. This field is advancing towards personalised strategies that integrate omics-based profiling, advanced in vitro and in vivo models, and non-invasive neurophysiological recordings to translate mechanistic insights into preventive and therapeutic interventions with global significance.

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Gut-Brain Axis Interactions and Neuropsychological Outcomes publication trend

The graph below shows the total number of articles in gut-brain axis interactions and neuropsychological outcomes across all publications each year (not limited to Nature Index journals).

Technical terms

Gut-brain axis: Bidirectional communication network linking the gastrointestinal tract and the central nervous system via neural, immune, endocrine and metabolic pathways.

Dysbiosis: Imbalance in the composition or function of gut microbiota, often associated with disease states.

Kynurenine pathway: Metabolic route converting tryptophan into neuroactive metabolites, some of which are neurotoxic and contribute to neuroinflammation.

Electrogastrography (EGG): Non-invasive recording of gastric electrical activity used to assess gut rhythmicity.

Phase-amplitude coupling (PAC): Analytical measure of the interaction between the phase of one neural rhythm and the amplitude of another, indicative of cross-frequency communication.

References

1. Gut–Brain Axis and Neuroinflammation: The Role of Gut Permeability and the Kynurenine Pathway in Neurological Disorders. Cellular and Molecular Neurobiology (2024).
2. The microbiota–gut–brain axis: pathways to better brain health. Perspectives on what we know, what we need to investigate and how to put knowledge into practice. Cellular and Molecular Life Sciences (2022).
3. Simultaneous Gut-Brain Electrophysiology Shows Cognition and Satiety Specific Coupling. Sensors (2022).