Tetrad of Media Effects

 ”Generally speaking, a tetrad is any set of four things. In Laws of Media (1988) and The Global Village (1989), published posthumously,Marshall McLuhan summarized his ideas about media in a concise tetrad of media effects. The tetrad is a means of examining the effects on society of any technology/medium (put another way: a means of explaining the social processes underlying the adoption of a technology/medium^[1]) by dividing its effects into four categories and displaying them simultaneously. McLuhan designed the tetrad as a pedagogical tool, phrasing his laws as questions with which to consider any medium:

1. What does the medium enhance?
2. What does the medium make obsolete?
3. What does the medium retrieve that had been obsolesced earlier?
4. What does the medium flip into when pushed to extremes?

The laws of the tetrad exist simultaneously, not successively or chronologically, and allow the questioner to explore the “grammar and syntax” of the “language” of media. McLuhan departs from his mentor Harold Innis in suggesting that a medium “overheats”, or reverses into an opposing form, when taken to its extreme.^[2]

Visually, a tetrad can be depicted as four diamonds forming an X, with the name of a medium in the center. The two diamonds on the left of a tetrad are the Enhancement and Retrieval qualities of the medium, both Figure qualities. The two diamonds on the right of a tetrad are theObsolescence and Reversal qualities, both Ground qualities.^[3]

• Enhancement (figure): What the medium amplifies or intensifies. For example, radio amplifies news and music via sound.
• Obsolescence (ground): What the medium drives out of prominence. Radio reduces the importance of print and the visual.
• Retrieval (figure): What the medium recovers which was previously lost. Radio returns the spoken word to the forefront.
• Reversal (ground): What the medium does when pushed to its limits. Acoustic radio flips into audio-visual TV.”

Hot & Cool Media

“In the first part of Understanding Media, McLuhan also stated that different media invite different degrees of participation on the part of a person who chooses to consume a medium. Some media, like the movies, enhance one single sense, in this case vision, in such a manner that a person does not need to exert much effort in filling in the details of a movie image. McLuhan contrasted this with TV, which he claimed requires more effort on the part of viewer to determine meaning, and comics, which due to their minimal presentation of visual detail require a high degree of effort to fill in details that the cartoonist may have intended to portray. A movie is thus said by McLuhan to be “hot”, intensifying one single sense “high definition”, demanding a viewer’s attention, and a comic book to be “cool” and “low definition”, requiring much more conscious participation by the reader to extract value.^[39]

“Any hot medium allows of less participation than a cool one, as a lecture makes for less participation than a seminar, and a book for less than a dialogue.” ^[40]

Hot media usually, but not always, provide complete involvement without considerable stimulus. For example, print occupies visual space, uses visual senses, but can immerse its reader. Hot media favour analytical precision, quantitative analysis and sequential ordering, as they are usually sequential, linear and logical. They emphasize one sense (for example, of sight or sound) over the others. For this reason, hot media also include radio, as well as film, the lecture and photography.

Cool media, on the other hand, are usually, but not always, those that provide little involvement with substantial stimulus. They require more active participation on the part of the user, including the perception of abstract patterning and simultaneous comprehension of all parts. Therefore, according to McLuhan cool media include television, as well as the seminar andcartoons. McLuhan describes the term “cool media” as emerging from jazz and popular music and, in this context, is used to mean “detached.” (See: CBC Radio Archives)

This concept appears to force media into binary categories. However, McLuhan’s hot and cool exist on a continuum: they are more correctly measured on a scale than as dichotomous terms.^[6]“

^{Source: wikipedia.org}