The Redundancy Effect

The redundancy effect may appear on the surface to be related to the split-attention effect but in fact is quite unrelated. There are similarities because both effects deal with multiple sources of information such as visuals and text. As is the case for the split-attention effect, any combination of diagrams, pictures, animations and ­spoken or written verbal information can lead to the generation of extraneous ­cognitive load. Nevertheless, despite their surface similarities, the redundancy effect has very different characteristics to the split-attention effect. The two effects differ because the logical relations between the multiple sources of information required as essential pre-requisites to produce each effect differ; that difference is critical and should never be ignored.

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