Deodorized industrial life may starve empathy circuits, new hypothesis proposes

When confronted with extreme human violence, many cultures reach for a familiar label: bestial. A new hypothesis and theory article in Frontiers in Ethology argues that this reflexive comparison is not only unfair to animals but, in the authors' view, scientifically backwards. Daniela Alberghina of the University of Palermo and Lindsay Murray of the University of Chester propose that intraspecific violence in animals is typically mediated by stable, regulatory feedback systems, whereas modern human pathology reflects something different: a profound sensory loneliness produced by the decoupling of our species from ancient bio-behavioral scaffolds.

In their framing, today's social pathologies are not a regression to an animalistic nature but the consequence of environmental disruption to evolved bio-behavioral requirements. The centerpiece of the paper is what the authors call the Olfactorily Disconnected and Disinhibited (ODD) hypothesis. Applying a neuro-ethological lens, they argue that the deodorized landscape of industrial life leaves the human orbitofrontal cortex starved of its ancestral sensory anchors, producing what they describe as a structural bio-behavioral discordance.

The hypothesis takes its name from the two changes they attribute to this condition: disconnection from the chemical signals that anchored human social behavior, and disinhibition of impulses that, in their account, such signals help regulate. The authors position the orbitofrontal cortex as the brain region deprived of olfactory input in sanitized environments, and they frame the resulting discordance as a mismatch between evolved bio-behavioral expectations and modern surroundings rather than as individual moral failure. To build the case, the authors turn to comparative ethology and to domesticated species and comparative non-human models as biological sentinels.

Animals whose lives remain governed by what the paper calls chemical honesty and multisensory feedback, they argue, offer a living reference point for socially regulated behavior when sensory input is intact. They also point to disrupted social structures in translocated wildlife as comparative models of what happens when animals are removed from their established social and sensory contexts, a parallel they use to illuminate the human condition in industrialized environments. In the authors' view, these sentinels show that social regulation depends on environmental continuity rather than on the suppression of an inner beast.

Crucially, the proposal is presented as a framework rather than a settled empirical finding. The paper synthesizes comparative ethology with neurobiological findings to argue that the human capacity for empathy is not lost but dormant, obscured by the cultural mandates of modern, disconnected environments. Restoring social health, they conclude, requires a conscious realignment with the bio-behavioral rhythms and interspecies connections that remain, in their words, the hallmark of a healthy, functioning society.

The paper is explicit about its status. It is a hypothesis and theory article, received in July 2026 and accepted in September 2026, and the authors state that all claims expressed are solely those of the researchers and do not necessarily represent their affiliated organizations or the publisher. Whether the ODD hypothesis can withstand empirical testing remains an open question, and the authors present the framework as a provocative reframing rather than a demonstrated mechanism.

The core claim is that the problem is not that humans are too animal-like, but that modern life has cut them off from the sensory scaffolds that, in the authors' account, animals and human ancestors never lost. Until the framework is tested, it stands as an argument for seeing human social pathology through an ethological mirror rather than a bestial one.

Subject of Research: A neuro-ethological hypothesis linking olfactory deprivation in industrialized environments to impaired human empathy and social behavior

Article Title: The ethological mirror and the olfactorily disconnected and disinhibited hypothesis: reclaiming human social efficacy and empathy through interspecies sensory alignment

Article References: Alberghina, D., & Murray, L. (2026). The ethological mirror and the olfactorily disconnected and disinhibited hypothesis: reclaiming human social efficacy and empathy through interspecies sensory alignment. Frontiers in Ethology, 5, Article 1940624. https://doi.org/10.3389/fetho.2026.1940624

Image Credits: AI Generated

DOI: 10.3389/fetho.2026.1940624

Keywords: neuro-ethology, olfaction, empathy, animal behavior, evolutionary mismatch, orbitofrontal cortex, social buffering, hypothesis, ethological, mirror, olfactorily, disconnected