I don’t know it in this context, as in my exposure, is not an imaginary friend. My understanding comes from the field of developmental psychology. The concept is that infants during early development understand that an object exists even when it can’t be seen or heard. So if the infant goes out with mum or dad, but leave the pet dog at home, even though the child can’t see or hear the dog, they have learned that dogs exist. They reinforce this knowledge of when out, they see a dog ad say “doggy, doggy, doggy”. The age that this happens in developing humans is still not agreed.
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