When we are teaching students new skills or reviewing skills that they already have learned, we rely on information based on learning channels. Each learning channel has an input and an output. There are many different kinds of each. Eric and Elizabeth Haughton pioneered much of the work on learning channels in the 1970’s.
This work was attempting to add clarity to what was the emerging notion of “learning styles” a phenomenon which became very popular with teachers and parents at the time. People talked about being a “visual learner” or an “auditory learner” as the main way in which they processed information.