In the previous slide, even though the news article claimed to have “conclusively demonstrated severe and multiple disruptions,” the “black holes” don't indicate dropout of actual brain tissue. They're a result of threshold-setting: assigning “black vs. colour” at a particular signal value, with the choice of value entirely subjective. This is just one of the many caveats of neuroimaging. In human neuroimaging, for example, actual photographs are rare; more often, images are proxy signals for some biological event that have been digitized and computerized, reconstructed and transformed, and subjected to statistical testing and interpretation. Signals are small, assumptions are many, and at every point, a person intervenes in producing what will ultimately be displayed. The result can sometimes be utter junk—as demonstrated in a study that flashed pictures of human social interactions, and "found" associated brain activation...in a dead fish. Neuroimaging techniques, no matter how brilliant, are removed biological events, so can't always be assumed to accurately reflect them. Addiction neuroimaging is a tricky area: the field is fraught with political static and agenda. Combine this with the computational limitations of neuroimaging, and emotionally charged headlines can ensue. Ultimately, though, a tool that can visualize the hardware of the mind is extremely valuable in any mental health field. It's a privilege and a thrill to think of the possibilities ahead.
Doris Payer received her Ph.D. in Neuroscience from UCLA, where she trained in the NeuroImaging Training Program and the Center for Addictive Behaviors. She's now a Post-Doc in the Addiction Imaging Research Group at the Centre for Addiction and Mental Health in Toronto, making pretty pictures of brains with various impulse control disorders.