cognitive decline and more about how our emotional perception changes over time. centered in an area of the brain called insular core cortex. the part of the brain that registers disgust. two groups one average age 23. one average age 68 and showed them pictures of people who looked like they were untrustworthy and here is what they found when they put those people in an mri. in the younger brain the area of that cortex that registered disgust lit up like a warning sign. stop, don't go any further. in the older brains it didn't register at all it was just like those untrustworthy people looked library anyone else. researchers don't know why structural problems or shrink damage in that area. shelly taylor, as people get older they tend to lose that gut feeling something is wrong. >> if you are not getting that signal, it's not figuring into your decision-making. you could falsely believe that a pitch of some kind is a good