In line with the considerations touched upon at the end of the previous chapter, we should ask whether enough matter is disturbed by the passage of the signal that the one-graviton criterion of that chapter is met. While it is true that an impressively enormous magnification is achieved by the retina in converting the photon’s energy into a movement of mass in the actual signal – perhaps by a factor of as much as 1020 in mass moved – this mass still falls short of the Planck mass mp by a very large figure (say about 108). However, a nerve signal creates a detectable changing electric field in
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