Aberrant decoding or aberrant reading is a concept used in fields such as communication and media studies, semiotics, and journalism about how messages can be interpreted differently from what was intended by their sender. The concept was proposed by Umberto Eco in an article published first in 1965 in Italian and in 1972 in English.
Every communication act requires that the messages must be encoded into a set of signs by the sender. These signs must then be transmitted and decoded by the receiver to understand the contained messages. The code system must be shared by both the sender and the receiver in order for the communication to succeed. For example, thoughts must be encoded into words, transmitted through air, and then be decoded back to thoughts. Often the sender has a certain meaning to convey with his message, hoping the receiver will interpret it correctly. This right interpretation can be called the preferred decoding or preferred reading. When the interpretation of the message is different from what was intended, this can be called aberrant decoding. Aberrant decodings can occur in a more widespread range of situations, as wrong interpretation of a media product or text whose incoming message is not the one intended by the creator of the product or text.
According to Eco, aberrant decodings were rare in pre-industrial societies, when most communication occurred between people who shared the same culture. He lists four classes of exceptions where aberrant decodings could have happened:
People who did not share the same language.
People trying to interpret the meanings of past cultures. For example, Medieval people looking at Roman art.
People who did not share the same belief system. For example, Christians looking at pagan art.
People who came from different cultures. For example, white Europeans looking at Aboriginal art.
Eco continues that in contemporary media, instead of being exceptions, aberrant decodings have become the norm. For example, TV broadcasters know beforehand that their messages will be interpreted in various ways.