Principles of Neuroscience, 10th Edition

[Excerpt from Principles of Neuroscience, 10th Edition]

...the brain was once considered too "warm, wet, and noisy" for seemingly delicate quantum processes. However, the discovery of quantum coherence in biological processes such as plant photosynthesis, avian navigation, and our own sense of smell, paved the way for the eventual discovery of quantum vibrations inside the mircotubules of neurons.