People ignore security warnings up to 90 percent of the time

Software developers listen up: if you want people to pay attention to your security warnings on their computers or mobile devices, you need to make them pop up at better times.

A new study from BYU, in collaboration with Google Chrome engineers, finds the status quo of warning messages appearing haphazardly—while people are typing, watching a video, uploading files, etc.—results in up to 90 percent of users disregarding them.

Researchers found these times are less effective because of "dual task interference," a neural limitation where even simple tasks can't be simultaneously performed without significant performance loss. Or, in human terms, multitasking.

"We found that the brain can't handle multitasking very well," said study coauthor and BYU information systems professor Anthony Vance. "Software developers categorically present these messages without any regard to what the user is doing. They interrupt us constantly and our research shows there's a high penalty that comes by presenting these messages at random times."

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