Abstract
Event-related potential (ERP) studies are very specialized ones that can be used only to investigate specific problems to get a different perspective with respect to more traditional measurements techniques. The peculiarity of ERP measures (time windows, repetitions, etc.) requires a careful design of the experimental protocol to obtain meaningful data. In this paper we discuss how ERPs can be used to study elicitation of emotional perception by means of familiar visual stimuli and, as well, its modification due to the proposition of unexpected stimuli.