MRI brain scans reveal the way we perceive, or simply ignore, security warnings.

Companies spend nearly $100 billion on securing computers each year, yet incidents such as ransomware crippling hospitals and personal data leaking online remain common. Anthony Vance thinks that defensive measures could be more effective if we paid more attention to the hardware between our ears.

“Security professionals need to worry not only about attackers but the neurobiology of their users,” said Vance, an associate professor at Brigham Young University, this week at the Enigma security conference in Oakland, California. His lab uses functional MRI scans of people’s brains to reveal the unconscious mechanisms behind the way they perceive—or ignore—security warnings.

One of Vance’s studies led him to collaborate with Google on tests of a new approach to displaying security warnings in the Chrome Web browser that people were less likely to dismiss offhand. Vance says Google's engineers told him they plan to add the feature to an upcoming version of Chrome. Google did not respond to a request for confirmation of when it would be added.

Daniela Olivera, an associate professor at the University of Florida, says such research can help suggest ways to refine the usability of security tools and features—an area many researchers say the industry has tended to overlook. Incidents ranging from common malware infections to high-profile breaches like the DNC one that exposed John Podesta’s e-mails often involve a person making a hasty decision about a warning message or strange e-mail.

Multitasking is partly to blame. Vance’s collaboration with Google grew out of experiments that showed when people reacted to security warnings while also performing another task, brain activity in areas associated with fully engaging with a warning was significantly reduced. People were three times less likely to correctly interpret a message when they reacted to security warnings while also performing another task.

Vance’s lab teamed up with Google to test a version of Chrome modified to deliver warnings about a person’s computer possibly being infected by malware or adware only when they weren’t deeply engaged in something. For example, it would wait until someone finished watching a video, or was waiting for a file to download or upload, to pop up the message.