Paul Allen’s institute maps a mouse brain
The Allen Institute for Brain Science has published a paper in Nature describing how they have posted a comprehensive data set on the wiring of a mouse brain. The data is freely available at the Allen Mouse Brain Connectivity Atlas, in case you want to see for yourself. A mouse brain has 75 million neurons, far fewer than the 100 or so billion in a human brain. The only species for which we so far have a complete wiring diagram (or "connectome") is the C. Elegans worm, with only 302 neurons. The researchers used genetically engineered viruses to illuminate and trace individual...