Summary: 

I propose that infants imprint the faces of people they look at enough.

Here are the details:

    1. If a baby looks long enough at a face, that face imprints. That means that an image of that face is permanently stored in the brain.

    2. There is some time period when a baby can imprint faces, most likely in the first 6-8 months of life.

    3. I don't know how much a baby needs to look at a face before it imprints.

    4. The mother and father are the most commonly imprinted faces. However, older siblings, caretakers, or anyone consistently present during the baby's first few months of life could be imprinted.

    5. People who can't be imprinted include younger siblings and current friends or spouses.

    6. To determine if a person's face is imprinted, look at and talk to a picture of that person about something personal. A person whose face is imprinted elicits a noticeably stronger hand different emotional reaction than a person whose face is not imprinted.

    7. Another way to tell whether or not a person's face is imprinted is by listening to your complaints about people and life in general. As explained in the Complaints section, complaints about people are also complaints about someone whose face is imprinted.

Note: People whose faces are imprinted I call imprinted parents.