Angela Haupt in Time Magazine:
Thirty years ago, when Thomas Brinthaupt became a new parent—and was in the thick of long, sleep-deprived days and nights—he started coping by talking out loud to himself. That inspired him to research why people engage in this type of self-talk. A few key reasons have emerged, including social isolation: As you might expect, people who spend lots of time alone are more likely to keep themselves company by chit-chatting out loud. (Brinthaupt’s mother lived by herself, and after he overheard her solo conversations, she told him talking to herself helped her get through the day.) The same goes for only children—who engage in self-talk more frequently than those with siblings—as well as adults who had an imaginary companion they talked to when they were kids.
The other main reason why people talk out loud to themselves is to deal with “situations that are novel or highly stressful, or where you’re not sure what to do or think or feel,” says Brinthaupt, a professor emeritus of psychology at Middle Tennessee State University. Studies have found that when you’re anxious or experiencing, for example, obsessive-compulsive tendencies, you’re much more likely to talk to yourself. Upsetting or disturbing experiences make people want to resolve or understand them—and self-talk is a tool that helps them do so, he says.
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