The part of the brain that refocuses your attention from the paper to the crash is Reticular formation
Reticular formation is a nerve cell that controls involuntary actions such as sneezing in the body. It also controls reflexive movement that happens when the body is immediately responds to an action. Reflexive movement helps protect the body from danger as it triggers the nerve cells when it senses something wrong.
From the scenario in the question, while reading a newspaper, suddenly there was a crash in the street. At this point our attention is diverted from the newspaper to the crash. This is an example of a reticular formation.
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