Peekaboo (also spelled Peek-a-Boo) is a form of play primarily played with an infant. To play, one player hides their face, pops back into the view of the other, and says Peekaboo!, sometimes followed by I see you! There are many variations: for example, where trees are involved, "Hiding behind that tree!" is sometimes added. Another variation involves saying "Where's the baby?" while the face is covered and "There's the baby!" when uncovering the face.
Peekaboo uses the fundamental structure of all good jokes—surprise, balanced with expectation.
Peekaboo is thought by developmental psychologists to demonstrate an infant's inability to understand object permanence. Object permanence is an important stage of cognitive development for infants. In early sensorimotor stages, the infant is completely unable to comprehend object permanence.
Linguist Iris Nomikou has compared the game to a dialogue given the predictable back-and-forth pattern.  Other reserches have called the game “protoconversation" a way to teach an infant the timing and the structure of social exchanges.
Psychologist Jean Piaget conducted experiments with infants which led him to conclude that this awareness was typically achieved at eight to nine months of age. Infants before this age are too young to understand object permanence. A lack of object permanence can lead to A-not-B errors, where children reach for a thing at a place where it should not be.
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- Stafford, Tom (April 18, 2014). "Why All Babies Love Peekaboo". BBC.
- Mayers, David (2011). Exploring Psychology. New York, NY: Worth. ISBN 978-1-4292-1635-7.
- Nomikou, Iris; Leonardi, Giuseppe; Radkowska, Alicja; Rączaszek-Leonardi, Joanna; Rohlfing, Katharina J. (2017-10-10). "Taking Up an Active Role: Emerging Participation in Early Mother–Infant Interaction during Peekaboo Routines". Frontiers in Psychology. 8. doi:10.3389/fpsyg.2017.01656. ISSN 1664-1078. PMC 5641350. PMID 29066985.
- "PsycNET". psycnet.apa.org. Retrieved 2019-08-13.