The scientific study of the nervous system increased significantly during the second half of the twentieth century, principally due to advances in molecular biology, electrophysiology, and computational neuroscience. This has allowed neuroscientists to study the nervous system in all its aspects: how it is structured, how it works, how it develops, how it malfunctions, and how it can be changed.
Perhaps one of the main unsolved problems in modern neuroscience is the so-called "cell types" problem which refers to the categorization, definition, and identification of all neuronal/astrocytic cell types in an organism. Modern advances in the classification of neuronal cells have been enabled by electrophysiological recording, single-cell genetic sequencing, and high-quality microscopy, which have been recently combined into a single method pipeline called Patch-seq in which all 3 methods are simultaneously applied using miniature tools. The efficiency of this method and the large amounts of data that is generated allowed researchers to make some general conclusions about cell types.