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Improvising can be tough on the spot, especially for politicians. Spontaneity is an illusion of meticulous design and one of the most effective rhetorical devices for creating spontaneity is metanoia- correcting or changing one's mind.

This article talks about an illusion our brain pulls on called the McGurk effect. This is when visual speech is mismatched with auditory speech and can result in the perception of an entirely different message. The example the article uses is if the visual "ga" were combined with the sound "ba", this results in the perception of "da." Vased on the principle of causal inference, researchers were able to create an algorithm model of multi-sensory speech perception. What this means is that when your brain is given a particular pair of auditory and visual syllables, it calculates the likelihood that they are from a single talker compared to multiple talkers and uses this likelihood to determine the final speech perception.