 Concerning the choice of the parameters of the model, it has to be stressed that, as it is obvious, the just mentioned transition region from micro to macro depends crucially on their values. departing from the original choice of GRW, Adler (2003) has suggested to increase the value of \(f\) by a factor of the order of \(10^9\). The reasons for this derive from requiring that during latent image formation in photography, the collapse becomes effective right after a grain of the emulsion has been excited; this is equivalent to requiring that when a human eye is hit by few photons (the perceptual threshold being very low) reduction takes place in the rods of the eye (Bassi, Deckert and Ferialdi 2010). As we will discuss in what follows, if one takes the original GRW value for \(f\), reduction cannot occur in the rods (because a relatively small number of molecules—less than \(10^5\)—are affected), but only during the transmission along the nervous signal within the brain, a process which involves the displacement of a number of ions of the order of \(10^{12}\).