In this article, the researcher explains that his group's success was attributed to stacking 3D-printed layers horizontally instead of the traditional approach of stacking them vertically when creating new tissue. That enabled the new stem cells to communicate with each other and grow together. 

Now that the tissue can function like typical brain cells, the work of understanding neurological disorders such as Alzheimer's and Parkinson's disease can accelerate and help people around the world for generations to come.