Which theorist said that mass media are extensions of the human body and human mind?

Question

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Marshall McLuhan is the theorist who said that mass media are extensions of the human body and human mind. This theory is reflected in his famous quote, "The medium is the message," which emphasizes the idea that the way information is communicated is just as important as the message itself. McLuhan believed that mass media had the power to reshape human experience and transform social relations.

Which Theorist Said That Mass Media Are Extensions of the Human