Study: Bugs Aren't Scary, They're Disgusting

Researchers at Georgia Tech Uncover How the Brain Reacts to Seeing Insects and Other Pests

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Jul 25, 2018, 07:00 ET

ATLANTA, July 25, 2018 /PRNewswire/ -- To determine how the human brain reacts to seeing insects and other pests, pest control leader Orkin partnered with the Georgia Institute of Technology (Georgia Tech) on a scientific research study.

Georgia Tech researchers discovered that pests seen in a home elicited the neurological reaction of "strong disgust," an emotion associated with avoiding contamination and disease.

"We expected to find that the study participants were afraid of pests," said Orkin Entomologist Mark Beavers, Ph.D. "The reaction of disgust is actually very significant, as many of the common household pests shown in the study can contaminate food and spread disease. It's amazing how the human brain has adapted to the potential problems posed by many of these pests, and reinforces why we all should take precautions to keep such pests away from where we live, work and play."

Study Details

Georgia Tech researchers used a functional Magnetic Resonance Imaging (fMRI) machine to monitor participants' brain activity and heart rate. Inside the fMRI machine, researchers showed participants a series of video clips depicting insects and animals in different environments. They were shown common household pests (including cockroaches, bed bugs, flies, spiders and rodents), as well as video clips of "frightening" animals (including sharks, lions and crocodiles).

Participants were also shown video clips of everyday occurrences (such as a waving flag), to serve as a control condition to compare neurological responses. Video clips were displayed in a random order, each clip lasting 15 seconds.

With nearly every participant, the pest videos triggered a reaction in the brain's insula, a region deep in the cerebral cortex associated with disgust. The amygdala, a portion of the brain associated with fear, was only triggered by videos of frightening animals.

"Insects in the home produced more disgust in the brain than insects in the wild, especially cockroaches." said Dr. Eric Schumacher, director of Georgia Tech's Center for Advanced Brain Imaging. "Our research suggest that we may be conditioned against pests in the home, because they may be associated with contamination or illness," he said.

Twenty adults participated in the study, including 12 females and eight males.

Participants also ranked their own anxiety while viewing videos of pests, using a hand-held rating device and through a post-scan survey. Seventy percent of the participants ranked their level of anxiety while viewing images of household pests as either mild, moderate or severe.

The study was presented by Georgia Tech researchers at the Cognitive Neuroscience Society (CNS) meeting in 2017. After receiving interest by peers at the conference, Georgia Tech is pursuing publication of the study in a medical journal.

Preventing Common Pests

Common household pests can be more than a "disgusting" nuisance; they can also be a health threat. It's important to take steps to minimize them in and around the home by taking the following steps:

Clean up spilled food and drinks quickly and keep food stored tightly, especially during outdoor picnics.
Remove standing water from buckets, toys and other containers, as mosquitoes can breed in just an inch of standing water.
Seal any entry points around windows and doorways.
Remove clutter, such as boxes and newspapers, as cockroaches and other pests can hide inside them.
Keep gutters and downspouts clean and keep plants away from the home's foundation.

About Orkin, LLC
Founded in 1901, Atlanta-based Orkin is an industry leader in essential pest control services and protection against termite damage, rodents and insects. The company operates more than 400 locations with almost 8,000 employees. Using a proprietary, three-step approach, Orkin provides customized services to approximately 1.7 million homeowners and businesses in the United States, Canada, Mexico, Europe, South America, Central America, the Middle East, the Caribbean, Asia, the Mediterranean and Africa. Orkin is committed to studying pest biology and applying scientifically proven methods. The company collaborates with the Centers for Disease Control and Prevention (CDC) and eight major universities to conduct research and help educate consumers and businesses on pest-related health threats. Since 2014, Orkin's Start with Science™ initiative has donated $670,000 to fund science and math projects in public schools across the nation. Learn more about Orkin at Orkin.com. Orkin is a wholly-owned subsidiary of Rollins Inc. (NYSE: ROL). Follow us on Facebook and LinkedIn.