ABSTRACT
D. G. Treichler's views have been reinforced by the theoretical orientations of a number of influential writers concerned with the audio-visual movement. D.E Broadbent's model was developed by R.M.W. Travers who placed the research scientists and audio-visual designers at opposite poles in their ideas concerning human information processing capacities. The initial application of information theory to radio-communications dealt with measures of information transmission rates and the capacities of channels of communication, and this was reflected in the field of physiological psychology. Implicit in the early models of information processing was the division of memory into two parts: short-term memory and long-term memory, each with different characteristics but with both being verbal storage systems. There is good evidence to support two complementary representation systems, along the lines suggested by A. Paivio, with extensive interconnections between verbal and image systems. This is acceptable to the multichannel advocates, and supports the early claims of the 'audio-visual' approach to educational technology.
