I don't think there can be a baseline. They would have had to scan a couple of hundred people 60 years ago to establish it. Plus, the results are on a very sma

I don't think there can be a baseline. They would have had to scan a couple of hundred people 60 years ago to establish it. Plus, the results are on a very small group. It's difficult for me to imagine that fMRI can reliably show differences. And it's also noticeable that they couch the effect in very vague terms: "similar pattern", "more youthful". That's a lot of freedom to interpret a few so much data. That they've found a bio-marker sounds implausible to me: all they've found is a correlation with a memory task that can't be measured without applying that task.