There are still kinks to iron out in neuroimaging technology before doctors can translate images of the brain to psychiatric disorders such as PTSD, researchers report.
Several years ago, the National Institutes of Mental Health launched a multi-billion-dollar research effort to locate biomarkers of brain activity that point to the biological roots of a host of mental health diseases, which today are typically identified by clinical evaluation of a constellation of often overlapping symptoms reported by patients.
“The idea is to forget classification of disease by symptoms and find underlying biological causes,” says Ilan Harpaz-Rotem, professor of psychiatry and psychology at Yale University and senior author of the study in the American Journal of Psychiatry.
For the new study, the research team attempted to replicate the findings of an earlier nationwide neuroimaging study, in which Emory and Harvard scientists linked clusters of brain activity to a variety of outcomes among patients who had arrived at United States emergency departments following traumatic events.
Specifically, when researchers measured patients’ brain activity during the performance of simple tasks—including ones that probe responses to threats and rewards—they detected a cluster of brain activity that showed high reactivity to both threat and reward signals and seemed to predict more severe symptoms of PTSD (post-traumatic stress disorder) later on.
However, when Yale researchers analyzed similar neuroimaging data collected from recent trauma survivors in Israel, they were not able to replicate these findings. While they did identify the different clusters of brain activity observed in the earlier study, they found no association with prospective PTSD symptoms.
“That is not to say one set of data is right and the other is wrong, just that there is a lot of fundamental work that needs to be done to develop reliable models that could generalize across different studies,” says Ziv Ben-Zion, a postdoctoral associate at Yale School of Medicine and the corresponding author of the study.
In fact, Yale researchers are currently working with the investigators of the original Emory-Harvard study to merge datasets “to search for common underlying patterns of brain activity associated with different responses to trauma,” Ben-Zion says.
“It took about 100 years to come up with current classifications of mental illness, but we’ve only been exploring refining psychiatric diagnoses using biomarkers for the last 10 years,” says Harpaz-Rotem. “We still have a long way to go.”
Source: Yale University