Specific neurological mechanisms underlie the feelings associated with loneliness
Multiple studies demonstrate that specific neurological, neuroendocrine, and neuroanatomical mechanisms—including limbic system dysfunction, opioid receptor alterations, and HPA axis dysregulation—underlie the feelings and states associated with loneliness.
The retrieved literature consistently points to distinct neurobiological, neuroendocrine, and neuroanatomical correlates of loneliness and social isolation, spanning limbic system and striatal dysfunction, opioid receptor changes, and neuroendocrine dysregulation. The claim is well-supported by multiple high-quality reviews and empirical studies.
D. Bzdok, Robin I. M. Dunbar. The Neurobiology of Social Distance. 2020. https://doi.org/10.1016/j.tics.2020.05.016
Paper [0] discusses the neurocognitive basis of social isolation and the deep consequences of perceived social isolation for well-being.
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Erika M. Vitale, Adam S. Smith. Neurobiology of Loneliness, Isolation, and Loss: Integrating Human and Animal Perspectives. 2022. https://doi.org/10.3389/fnbeh.2022.846315
Paper [1] highlights that loneliness and isolation are associated with dysfunction within specific brain areas such as the ventral striatum and limbic system.
John A. Tkaczynski, Jordan Riser, Maya Patel, Nicole Shellenbarger, Jin Park, Daniel Manvich, Daniel J. Chandler. Effects of social isolation on locus coeruleus opioid receptor expression and affective behavior. 2025. https://doi.org/10.1016/j.ynstr.2025.100717
Paper [3] demonstrates that social isolation leads to neuroadaptations including the downregulation of delta-opioid receptors and upregulation of kappa-opioid receptors in the locus coeruleus.
Mavrych V, Mansour GK, Hajjar AW, Bolgova O. Hormonal and Behavioral Consequences of Social Isolation and Loneliness: Neuroendocrine Mechanisms and Clinical Implications.. 2025. https://doi.org/10.3390/ijms27010084
Paper [7] links perceived social disconnection to hypothalamic-pituitary-adrenal axis dysfunction, altered glucocorticoid signaling, and reward-processing circuit alterations.
Liu L, Huang R, Shang YJ, Li S, Cen Y. Withdrawal-related threat sensitivity mediates associations between perceived rejection and loneliness: Divergent neural correlates in younger and older adults.. 2026. https://doi.org/10.3758/s13415-026-01454-w
Paper [11] provides evidence that gray matter volume in specific brain regions involved in self-referential and social-perceptual processing is associated with loneliness.
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