The research is aimed at studying the features of the effect of the first impression in the social perception, depending on the type of initial information about a person. Within the framework of the work, two experiments were conducted, which were devoted to the perception and evaluation of a person on the basis of their facial attractiveness and nicknames. The results of the experiments showed that subjects, during evaluation of a person, are more likely to rely on a subjectively formed impression of facial attractiveness than on information about persons’ nicknames. The results of the first experiment showed that the evaluation of attractive people with negative nicknames was slower than in the case of all other combinations. The presence of a negative nickname leads to a decrease in the evaluation of a person only if this information was received earlier than a subjective impression of his attractiveness was formed. The results of the second experiment showed that subjects who previously evaluated the facial attractiveness of a person, in the condition of a contradiction between attractiveness and a nickname, the amplitude of the late ERP peak P600, increases.