Trypophobia, characterized by a fear or aversion to clusters of small holes, is subject of both popular intrigue and scientific investigation. While it might seem trivial or peculiar, trypophobia significantly impacts a notable portion of the population. A recent paper published in Evolutionary Psychological Science examined the evolutionary underpinnings of trypophobia, offering two primary hypotheses to explain its origins: the dangerous animal hypothesis and the skin disease-avoidance hypothesis.
Gaëtan Thiebaut and colleagues situate trypophobia within the broader context of evolutionary psychology, a discipline that posits human behavior and mental processes are shaped by evolutionary pressures. Evolutionary psychologists argue that our brains are equipped with mental algorithms fine-tuned by natural selection to respond to environmental cues crucial for survival and reproduction.
This framework helps explain why certain phobias, such as fear of spiders or heights, are common—they provided survival benefits to our ancestors. Trypophobia may similarly have roots in evolutionary adaptations.
Studies have consistently found that a significant portion of the population exhibits symptoms of trypophobia. These findings suggest an inherent, possibly adaptive, reaction to specific visual stimuli.
One hypothesis explored in the paper is the dangerous animal hypothesis, which suggests that trypophobic reactions are a byproduct of an evolutionary adaptation to avoid dangerous animals. Many venomous creatures, like certain snakes and spiders, exhibit patterns that resemble clusters of holes.
Trypophobic patterns and images of venomous animals elicit similar neural responses, implying an innate avoidance mechanism. It may be our ancestors who quickly recognized and avoided these dangerous animals had a survival advantage, and this trait has been passed down through generations.
The dangerous animal hypothesis is supported by research showing that images of trypophobic patterns, like those found on venomous animals, provoke an increase in early posterior negativity—a neural response associated with the automatic processing of threatening visual information. This automatic response suggests that the aversion may be deeply embedded in our neural circuitry, evolved to enhance survival in environments where venomous creatures posed significant threats.
Another perspective is the skin disease-avoidance hypothesis, which argues that trypophobia is an evolved response to avoid infectious diseases. Many skin diseases and ectoparasites create patterns on the skin that resemble clusters of holes. This hypothesis is supported by studies showing that trypophobic reactions are closely linked to disgust, a primary emotion involved in disease avoidance. Research shows that individuals with higher sensitivity to pathogen-related disgust are more likely to experience trypophobia, suggesting that the fear of holes is linked to mechanisms evolved to protect against disease.
This hypothesis is further supported by physiological studies measuring heart rate, pupil dilation, and skin conductance in response to trypophobic images, which consistently show that trypophobic images elicit stronger physiological responses compared to neutral images, reinforcing the idea that trypophobia is tied to our biological makeup. By invoking disgust, trypophobia may have helped our ancestors steer clear of sources of infection and disease.
Despite its prevalence, trypophobia is not officially recognized in major diagnostic manuals like the DSM-5. The authors argue that the significant distress and avoidance behaviors observed in trypophobic individuals warrant its recognition as a legitimate phobia. While some researchers question the classification of trypophobia as a “true phobia,” the evidence presented in the paper suggests that it meets many of the diagnostic criteria outlined for specific phobias.
The debate centers on whether trypophobia causes clinically significant distress or impairment in social, occupational, or other important areas of functioning. Thiebaut and colleagues point out that many individuals with trypophobia report intense discomfort and avoidance behaviors that interfere with their daily lives, indicating that the condition has a substantial impact.
They advocate for more research to better understand the clinical characteristics of trypophobia and to determine its place within the spectrum of specific phobias. The paper notes that cognitive-behavioral therapy, exposure therapy, and medication are promising in treating trypophobia, with case studies demonstrating significant symptom improvement, though further research is needed to refine these therapeutic interventions.
Overall, this review underscores the importance of investigating trypophobia and similar conditions to better understand their origins, implications, and potential treatments within the framework of evolutionary psychology.
The paper, “Why are we Afraid of Holes? A Brief Review of Trypophobia Through an Adaptationist Lens”, was authored by Gaëtan Thiebaut, Alain Méot, Pavol Prokop, and Patrick Bonin.
