Philosophically, the notions of consciousness and subconscious can be traced back to the first existence of human being and the questioning of man's own existence. Different disciplines have studied these concepts regarding their meaning and usage throughout history, and the subject of research has been made. Regarding consciousness and subconsciousness, there are also discussions in terms of both concept and scope, arising from the perspectives and working methodologies of different disciplines. Semantic differences in consciousness and subconscious are not only found in researchers' applications or naming, but also in the media and in daily life. In terms of subliminal advertising, understanding the concepts of consciousness and subliminal is very important for future studies in this field. Conceptually, the correct analysis of consciousness and the subliminal concepts in terms of advertising discipline will also provide a sturdy basis for how stimuli are perceived and the perception process. In this study, it is aimed to contribute to the literature by examining consciousness and subconscious conceptually in terms of subconscious advertising in its historical process. The study also aims to make a healthy direction and contribute to future research on possible subconscious advertising by making conceptual definitions.