This volume of the monograph includes thematic sections: the seventh, devoted to the problem of the role of the unconscious in mental activity; eighth, where the association of the unconscious with speech activity is analyzed; the ninth, aimed at considering the current ideas about the unconscious as a factor in the formation of personality: and, finally, the tenth, highlighting some of the modern methodological approaches to the problem of the unconscious. In addition, the third volume of the monograph contains a general "Conclusion" from the editorial office.