Cruelty often appears, on the surface, to be about power. Control. Superiority. A momentary advantage over another person. But beneath that surface, neuroscience suggests something more complicated is happening — not just socially, but biologically.

In studies of empathy and moral cognition, researchers have identified a network of brain regions that allows humans to resonate with the emotional states of others. The anterior insula and anterior cingulate cortex, for example, are strongly involved in processing another person’s pain as if it were meaningful to the self. The amygdala helps assign emotional significance to distress cues. Together, these systems form part of what allows human beings to feel “with” others rather than simply observe them.

In individuals with pronounced callous or psychopathic traits, these systems often respond differently. Functional imaging studies show reduced activation in empathy-related regions when observing others in pain. Emotional signals that typically register as salient or distressing may be muted or fail to fully engage.

This does not necessarily mean such individuals feel nothing. Rather, the emotional architecture that links perception of suffering with internal resonance appears less responsive.

At the same time, another system may become more influential: the brain’s reward circuitry. In certain individuals and contexts, acts associated with dominance, control, or even harm can activate dopaminergic pathways involved in reinforcement learning — particularly the ventral striatum and related reward regions. Behaviour that reduces emotional discomfort or produces a sense of control can, over time, become reinforced.

But reinforcement is not without consequence.

The human brain is shaped by repetition. Neural systems strengthen with use and weaken with disuse. When empathy circuits are consistently bypassed — when another person’s distress is not internally registered or acted upon — those pathways may become less dominant over time. Not destroyed, but deprioritised.

What emerges is not simply “more pleasure in cruelty,” but a narrowing of emotional range.

The systems that support emotional connection — including prefrontal regions involved in moral valuation and the integration of social meaning — may become less engaged in interpersonal contexts. Relationships can begin to lose their reciprocal emotional texture. Other people become easier to influence, but harder to truly feel with.

This is where the paradox of cruelty becomes most visible. What may begin as a subjective sense of strength or control can, over time, reduce the very capacity that makes connection, intimacy, and shared joy possible.

Human connection is not just psychological; it is biological reinforcement. Bonding systems involving dopamine, oxytocin, and endogenous opioids are activated through trust, reciprocity, and emotional attunement. When those systems are repeatedly sidelined in favour of dominance-based interaction, the reward landscape itself shifts.

Not toward richness — but toward restriction.

Importantly, neuroscience does not frame this as moral failure encoded in biology, nor as a fixed identity. The brain remains plastic. Patterns of social engagement continue to shape neural responsiveness across the lifespan. But it does suggest something essential: how we relate to others changes how we are able to experience others.

Cruelty may feel like control in the moment. But the longer arc is often not expansion, but contraction — of empathy, of connection, and of the emotional range that makes human life fully shared.

And what is lost is not just the other person’s experience of suffering.

It is the capacity to fully experience them at all.