Scientists can measure criminal intent - at least in the moment

Intent to commit a crime is a crucial factor in determining prison sentences, yet some theorists have worried that different grades of criminal intent are fictions and so should not be given weight in courtrooms. A new neuroimaging study suggests it is possible to measure the subtle variations in intent that matter to law - at least while a crime is being committed. Brain activity reveals whether people know they are committing a crime or are merely being reckless, according to research published the week of March 6 in the Proceedings of the National Academy of Sciences. 'We are not replacing juries with brain scanners, but we can now say that some debated differences in degree of criminal intent have a real neural basis,' said Yale's Gideon Yaffe, professor of law, philosophy, and psychology. Researchers from Yale University and the Virginia Tech Carilion Institute, under the auspices of the MacArthur Foundation's Research Network on Law and Neuroscience, asked 40 subjects to decide whether to take a suitcase through a security checkpoint. During some trials, the subjects knew there was contraband in the suitcase. In others, they were aware only that there was a risk they might be carrying contraband.