Through the 20th century various researches done on mass communication and its effects by branches like sociology, culture, history, political science and geography. In time, the term ''mass communication'' was replaced by ''media''; and this established the ground for terms like ''Media Psychology'' and ''Media Sociology''. Through the 20th century, many researchers from various disciplines analyzed mass communication with psychological concepts. In this study, works which uses psychological concepts to analyze but predates classification of inter-disciplinary Media Psychology in the mid-eighties as a sub branch of Psychology, are collected and looked into by classifying them based on popular mass communication mediums of the different eras. Aim of this study is to detect psychological concepts in those pioneer researches and to determine places of those concepts in today’s researches in Media Psychology. Based on the collected works, study shows the roots of the todays Media Psycholo