Psychopaths do laugh, but the way they experience and use laughter differs from most people in measurable ways. They can find things funny, tell jokes, and laugh out loud. What’s different is what makes them laugh, how their brains respond to other people’s laughter, and whether laughter serves a social or purely self-interested function.
Why Contagious Laughter Falls Flat
Most people experience laughter as contagious. You hear someone crack up and you feel a pull to join in, even before you know what’s funny. This automatic response depends on a brain region called the anterior insula, which helps connect what you hear to what you feel and how you respond physically. In people with high psychopathic traits, this region shows significantly reduced activation when hearing laughter.
A neuroimaging study published in Current Biology examined boys at risk for psychopathy and found two key differences. First, all boys with behavioral problems showed reduced activity in a premotor region that primes the body to laugh along with others. Second, boys who also scored high on callous and unemotional traits (the personality features most closely linked to psychopathy) showed an additional reduction in the anterior insula. This group also reported less desire to join in when they heard other people laughing. The reduced brain response partly explained why they felt less urge to laugh along.
This matters because contagious laughter is one of the earliest social glues humans develop. It builds bonds, signals safety, and creates shared emotional moments. When that automatic pull is weaker, laughter becomes something you observe rather than something that sweeps you up. A psychopath can still choose to laugh in a social situation, but the involuntary, infectious quality is diminished.
What Psychopaths Find Funny
The humor preferences of people with psychopathic traits skew in a specific direction. Research consistently links these traits to enjoying laughing at others, a disposition researchers call katagelasticism. A study of 233 adults found that psychopathic personality traits were “robustly related” to the enjoyment of laughing at other people. This tendency was most strongly tied to two specific facets: a manipulative, impulsive lifestyle and emotional coldness.
When researchers broke down humor styles more precisely, the impulsive and antisocial dimension of psychopathy was the strongest predictor of aggressive humor, the kind that puts others down or uses ridicule. The relationship was notably strong, with impulsivity predicting aggressive humor use more than any other personality factor in the analysis. Meanwhile, emotional coldness was negatively associated with affiliative humor, the warm, inclusive kind people use to strengthen friendships.
This creates a distinctive profile: people high in psychopathic traits tend to laugh readily at others’ expense but are less drawn to the kind of humor that brings people closer together. They’re not humorless. They simply gravitate toward humor that establishes dominance rather than connection.
Laughter as a Social Tool
People with psychopathic traits often score high on superficial charm, and laughter plays a role in that. The same study of 233 adults found that superficial charm was the one psychopathy facet with a clear positive relationship to overall sense of humor. In other words, the most socially polished aspect of psychopathy is also the one most connected to appearing funny and laughable.
This fits a broader pattern. Laughter is a powerful social signal. Even young children, by age three, can distinguish between friendly laughter and mean-spirited laughter, and they prefer to play with friendly laughers. Adults are even more attuned to these cues. For someone skilled at social manipulation, producing the right kind of laugh at the right moment is a way to build rapport, signal warmth, and put others at ease. The charm associated with psychopathy partly relies on deploying laughter strategically rather than experiencing it spontaneously.
There’s an interesting twist in the research on being laughed at. People with higher grandiosity and superficial charm actually reported enjoying being the target of laughter, likely because any social attention reinforces their sense of importance. But those scoring higher on the manipulative lifestyle dimension were more likely to fear being laughed at, possibly because ridicule threatens the control they work to maintain.
The Emotional Gap Behind the Laugh
The core issue isn’t whether psychopaths can produce laughter. It’s that the emotional machinery behind their laughter works differently. In most people, laughing together activates brain circuits tied to empathy, emotional resonance, and social bonding. These are precisely the circuits that show reduced function in psychopathy.
The anterior insula, the region that underperforms during laughter processing in those with high callous traits, does more than just trigger the urge to laugh along. It’s involved in experiencing emotions generally and in linking what you perceive to how you feel about it. When this region responds weakly to something as universally positive as laughter, it reflects a broader pattern: social signals that would normally generate a warm, automatic emotional response don’t land the same way.
Researchers who study this have suggested that this reduced laughter resonance could be one mechanism that impoverishes social relationships over time. If shared laughter doesn’t create the same internal reward, there’s less motivation to seek out genuine social connection, and the relationships that do form may lack the emotional depth that mutual laughter typically builds. The laughter still happens, but it’s more likely to serve a purpose (signaling charm, asserting dominance, mocking a target) than to reflect a moment of genuine shared joy.
Early Signs in Childhood
These differences appear early. The brain imaging research on laughter contagion focused on boys, not adults, and the patterns were already clear. Children who scored high on callous and unemotional traits showed measurably different brain responses to the sound of other people laughing. They were less drawn to join in and showed less neural preparation to do so.
At the same time, even typically developing children as young as three can detect the difference between friendly and mean laughter. Accuracy at reading these social cues improves between ages three and five. Children with callous traits may develop in an environment where they produce and encounter laughter but process it through a different emotional lens from the start. Over years, this subtle difference compounds: fewer moments of genuine shared laughter mean fewer opportunities to build the social bonds that steer development in a prosocial direction.