antdude writes with this excerpt from Ars Technica: Magnetic Resonance Imaging (MRIs) show our brains shutting down when we see security prompts. The MRI images show a "precipitous drop" in visual processing after even one repeated exposure to a standard security warning and a "large overall drop" after 13 of them. Previously, such warning fatigue has been observed only indirectly, such as one study finding that only 14 percent of participants recognized content changes to confirmation dialog boxes or another that recorded users clicking through one-half of all SSL warnings in less than two seconds.
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