Scansion short examples6/15/2023 Now, neuroscientists appear to be in a similar position, one that will require them to reconsider the results of many small studies. Geneticists eventually fixed the problem by expanding their studies from dozens or hundreds of people to millions, Thompson says. "Twenty years ago you'd hear someone had discovered a gene for criminality or for psychosis or a gene for autism," Thompson says, "and then another group wouldn't find the same thing, or they'd find another gene, and they'd be scratching their head." That's a lesson the field of genetics has already learned, says Paul Thompson, a neuroscientist at the University of Southern California who was not involved in the research. Nico Dosenbach, an author of the study and an associate professor of neurology at Washington University in St. "You need a very large sample, and bigger samples are better," says Dr. And the technology is great at revealing damage from a stroke, or areas that light up when we see a face.īut brain scan studies have yet to offer much insight into the underpinnings of traits like intelligence, or mental health conditions like anxiety and depression.Ī key reason is that these studies need to include scans of thousands of brains, instead of the dozens typically used, a team reported in the March 16 issue of the journal Nature. MRI scans have allowed researchers to peer inside the human brain. New research finds that previous studies of mental illness using brain scans may be too small for the results to be reliable.
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