Tal Sharf (right, senior author), Tjiste van der Molen (middle, postdoctoral researcher), and Greg Kaurala (left, staff researcher). Humans have long wondered when and how we begin to form thoughts.

All of us began as a single cell, the fertilized egg. This cell gave rise to a group of "stem cells" that can transform into any cell type in our body to create our complex tissues consisting of ...