Tetrad of media effects

Marshall McLuhan's tetrad of media effects uses a tetrad - a four-part construct - to examine the effects on society of any technology/medium (that is, a means of explaining the social processes underlying the adoption of a technology/medium) by dividing its effects into four categories and displaying them simultaneously. The tetrad first appeared in print in articles by McLuhan in the journals Technology and Culture (1975) and et cetera (1977). It first appeared in book form in his posthumously-published works Laws of Media (1988) and The Global Village (1989).

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