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 This is Scientific Amercian's 60 seconds sicence. I'm Ellie Wilkinson. Got a minute? If the side of Swiss cheese makes you melt, or the thought of a honeycomb gets you buzzing. You may suffer from a tripophobia, the most common phobia that you've probably never heard of. Tripophobia is the fear of holes. People with the phobia experience panic attacks, increase heart rate and hard sweats when they see clusters of holes. A visual scientist who suffers from tripophobia decided¹ to investigate the phenomenon with his colleague. They perform spectrum² analysis on images that induce tripophobia and found of the fear inducing images all have similar characteristics related to luminance, contrast and light wavelengths³, but they didn't know why these features cause such an adverse⁴ reaction. A study participant mentioned that certain animals also induce to his phobia. So the researchers analyzed⁵ pictures of poisonous animals, they discoverd that the tripophobia inducing images and those poisonous animals share the same visual features, suggesting the fear may be an evolutionary⁶ survival response. The study is in the journal Psychological Science. So if an English muffin induces his panic attack, your brain may just be saying ''better save and sorry.'' Thanks for the minute, for Scientific American's 60s Science. I'm Ellie Wilkinson.