... Their view determined a difference between automatic, and controlled processing, and differentiated between the two, for example they believed automatic to be fast, and controlled to be slow. Another proposal of Schneider and Shiffrin was that automatic processing, ' is unaffected by capacity limitations - does not affect the performance of other tasks attempted at the same time.' The 'Stroop effect' argued that this opinion was not strictly correct. The 'Stroop effect' shows that automatic tasks can interfere with simultaneously performed consciously controlled processing. What the participants are asked to do in this experiment is to say what colour each word is typed in, in two lists. The first list's words that are colours are each coloured according to what they say, e.g. red. The second list's words that are colours are each coloured differently to what they say, e.g. red. It was found that participants took a great deal longer, and ...

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