Brain & Technology is about the relationship between mind and technology, so about brain and lifelong learning, and therefore about the extended mind. More generally, humanity uses technology to outsource brain processes (mind) to smart devices, just as we partially outsource our digestion to cooking and skin protection to clothing. So the boundary between body and environment is by no means fixed, partly thanks to technology. A kind of weird way to say it, you could say that Brain & Technology is about border traffic, and about border possibilities and problems.