Our understanding of the human brain is constantly expanding. Yet, there have been many missteps in the past. In the 1880s, a popular subject for scientists to explore was Phrenology, measuring the skull to determine mental faculties.
Do we use only ten percent of our brain? It is a frequent conceit of advertisements, science fiction, and general trivia. Yet, In the course of a day, we use 100% of our brains.