Länk - Brus hinder för hjärnan att vara tätare packad

It turns out, however, that our neurons could be much smaller than they actually are. If you packed all material necessary for sending signals as tightly as possible, the branches of a neuron (called axons) would measure just .06 microns [about 2.3 millionths of an inch] across. In fact, the thinnest axons are about .1 microns [about 4 millionths of an inch]. Recent studies have shown that it's noise that prevents them from getting thinner. The thinner an axon gets, the noisier it becomes. Below .1 microns, the noise abruptly rises so much that it drowns out any signal. We might be far smarter if noise didn't keep us from growing more neurons.

Läs mer: Carl Zimmer's Dissection: Your Brain Is a Mess, but It Knows How to Make Fixes