One strip, the sensory cortex, receives and responds to ... the first 28 facial transplants ever performed, put Norris in a brain scanner and asked him to try to smile and open his mouth.

Too much sensory input can overstimulate your brain and cause emotional distress or shutdown. Sensory overload can happen with anxiety disorders, autism, and ADHD, but anyone can experience it.

Throughout their everyday life, most people engage in many activities that require varying degrees of attention. As they take ...