Brain mapping -- using light to observe and track neuron activity in the brain -- holds much promise for treating some of the most troubling conditions. Among its goals are treatment of stroke, epilepsy, Alzheimer's disease, and even depression. The field is claiming the attention of R&D funders as well. A White House announcement last week of a potential$100 million funding pot for brain research , as part of the presidential budget proposal for fiscal year 2014, made waves that echoed the response to an announcement last month of a far-reaching brain research program in Europe. As Mike Hatcher , editor of optics.org, noted, the White House-proposed BRAIN (Brain Research through Advancing Innovative Neurotechnoloiges) initiative still requires backing by a fractious Congress. “But if the public-private scheme does go ahead it will mirror an even larger funding proposal in Europe, where -- along with graphene research -- the ‘Human Brain Project’ was earmarked as ...