““Brains with insufficient life experience have not had the chance to model the world into a few heuristics, and must instead try to reason their way to the right result, not unlike how psychopaths, who lack any moral intuitions, must reason their way through moral dilemmas. When teenagers are placed in a scanner and asked things such as whether it is a good idea to swim with sharks, they show substantially more frontal activation than adults, most of whom have learned over many years that swimming with sharks belongs in the “don't do” category without having to think much at all about it. That is, teenagers can reason, but their worldview is still too constricted to allow that reason to reliably result in rational outcomes.48 Of course, brains develop at rates that differ across individuals, just as some seventeen year olds have had more brain-tuning experiences than others. As a result, as all parents know, some teenagers are more responsible than others. Likewise, some adults are less responsible than others. Until neuroscience can tell us which brains are sufficiently responsible on an individual level, and indeed what “sufficiently responsible” is, the law must continue to do what humans have always done – make gross classifications based on categories rather than on individuals.””
