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By asking a group of older adults to analyze videos of other people conversing — some talking truthfully, some insincerely — a group of scientists at the University of California, San Francisco has determined which areas of the brain govern a person’s ability to detect sarcasm and lies.
Some of the adults in the group were healthy, but many of the test subjects had neurodegenerative diseases that cause certain parts of the brain to deteriorate. The UCSF team mapped their brains using magnetic resonance imaging, MRI, which showed associations between the deteriorations of particular parts of the brain and the inability to detect insincere speech.
“These patients cannot detect lies,” said UCSF neuropsychologist Katherine Rankin, PhD, a member of the UCSF Memory and Aging Center and the senior author of the study. “This fact can help them be diagnosed earlier.”
The finding was presented April 14, 2011, at the 63rd Annual Meeting of the American Academy of Neurology in Hawaii, by Rankin and her postdoctoral fellow Tal Shany-Ur, PhD.