Brain-computer interfaces have already been successfully demonstrated and are getting more sophisticated every year. Unfortunately, early versions required that a hole be cut in one's skull, but future designs promise to be less invasive. Having sensors in the head will certainly help us understand how networks of neurons generate thought. They will also give us more access to our thoughts, or at least those that interface with the sensor. However, the brain-computer interface would have to be prohibitively extensive to map all of the interconnections and relationships in the brain that make us who we are.