Can we really distinguish a real face from one created artificially? Today, artificial image generation systems create physiognomies that are so convincing that it is nearly impossible to differentiate between the real and the artificial. In an experiment conducted at the Cognitive Electrophysiology Laboratory of the Department of Psychology at the University of Milan-Bicocca, a group of students were tasked with determining whether the faces presented were real or artificially generated, as well as their perceived attractiveness or familiarity. Artificial faces were identified in only 33% of cases, which is significantly lower than the chance criterion of 50%. However, the brain, which was monitored in real time with high-density electroencephalography (128 channels), was not fooled. This was demonstrated by the analysis of intracortical sources and the electrical potentials in low-resolution electromagnetic tomography, which enables the evaluation of the activity of various brain regions. The study demonstrated a considerable separation between conscious assessment and implicit neural response to AI-generated faces: the human brain processes them significantly differently than actual faces, distinguishing them even when the person is unable to recognize them as artificial. The University and the MUR (Milan University and Research Center) supported the work, which was published in Scientific Reports under the title "Neural signatures of hyper-realistic AI-generated faces: dissociating behavioral indistinguishability from implicit neural evaluation" and shows that AI-generated faces have crossed the threshold of the "uncanny valley".