Non sequitur (Latin for "it does not follow"), in formal logic, is an argument in which its conclusion does not follow from its premises. In a non sequitur, the conclusion could be either true or false, but the argument is fallacious because there is a disconnection between the premise and the conclusion.
In psychiatry, derailment refers to a pattern of discourse (in speech or writing) that is a sequence of unrelated or only remotely related ideas. The frame of reference often changes from one sentence to the next. Examples:
- "The traffic is rumbling along the main road. They are going to the north. Why do girls always play pantomime heroes."—given by Carl Schneider
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