 Aicardi et al. (1991) have presented a detailed answer to this criticism: it is agreed that in the considered case the superposition persists for long times (actually the superposition must persist since, being the system under consideration microscopic, one could perform interference experiments which everybody would expect to confirm quantum mechanics). However, to deal in the appropriate and correct way with such a criticism, one has to consider all the systems which enter into play (electron, screen, photons and brain) and the universal dynamics governing all relevant physical processes. A simple estimate of the number of ions which are involved in the transmission of the nervous signal up to the higher virtual cortex makes perfectly plausible that, in the process, a sufficient number of particles are displaced by a sufficient spatial amount to satisfy the conditions under which, according to the GRW theory, the suppression of the superposition of the two nervous signals will take place within the time scale of the perception.