Robert P Erickson1, Maria Teresa Fiorenza2. 1. Department of Pediatrics, University of Arizona School of Medicine, Tucson, AZ, 85724-5073, USA. Electronic address: erickson@peds.arizona.edu. 2. Division of Neuroscience, Department of Psychology, Sapienza University, Rome, Italy; IRCCS Fondazione Santa Lucia, Rome, Italy.