A century ago, Wilhelm Wundt set out to explain what psychology truly is — not a philosophy of the soul, but the rigorous study of direct, moment-by-moment experience. In these lectures, delivered with the clarity of a master teacher, Wundt defines the scope of experimental introspection, untangles the puzzle of mind and body, and explores the fabric of seeing, feeling, and willing from the inside out. This Modern Reader's Edition renders Wundt's original 1912 text into clear, flowing contemporary English. Archaic phrasing and convoluted constructions have been carefully smoothed away, while every core concept — apperception, creative synthesis, the tri-dimensional theory of feeling — remains faithful to his intended meaning. An authoritative introduction, chapter summaries, and a glossary of terms accompany the text, making this foundational work accessible to readers curious about the origins of modern psychology. Part of The Modern Wisdom Library.