Brain: Biological noise-based logic
  Neural spikes in the brain form stochastic sequences, i.e., belong to the class of pulse noises. This stochasticity is a counterintuitive feature because extracting information - such as the commonly supposed neural information of mean spike frequency - requires long times for reasonably low error probability. The mystery could be solved by noise-based logic, wherein randomness has an important function and allows large speed enhancements for special-purpose tasks, and the same mechanism is at work for the brain logic version of this concept. 
Laszlo B. Kish, Claes-Goran Granqvist, Sergey M. Bezrukov and Tamas   Horvath
cs.NE cs.ET