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The real reason people still back Bush and the war...

Cognitive dissonance is a psychological phenomenon which refers to the discomfort felt at a discrepancy between what you already know or believe, and new information or interpretation. It therefore occurs when there is a need to accommodate new ideas, and it may be necessary for it to develop so that we become "open" to them. Neighbour (1992) makes the generation of appropriate dissonance into a major feature of tutorial (and other) teaching: he shows how to drive this kind of intellectual wedge between learners' current beliefs and "reality". Beyond this benign if uncomfortable aspect, however, dissonance can go "over the top", leading to two interesting side-effects for learning: if someone is called upon to learn something which contradicts what they already think they know — particularly if they are committed to that prior knowledge — they are likely to resist the new learning. Even Carl Rogers recognised this. Accommodation is more difficult than Assimilation, in Piaget's terms. if learning something has been difficult, uncomfortable, or even humiliating enough, people are not likely to admit that the content of what has been learned is not valuable. To do so would be to admit that one has been "had", or "conned".