In adults, delta band frequencies are associated with deep dreamless sleep, very deep breathing, slow heart rate, and cool body temperatures (Frick & Wilbarger, 2017). From birth through age 2, in the waking state infant brains are predominantly in the lowest EEG frequency band of 0.5-4 Hz, which is the delta band (Lipton, 2005, p. Laibow’s research demonstrates that as the infant develops into a toddler, then a preschooler, then a young student, brainwave patterns shift from the slowest to faster and faster frequencies. Seminal research by Rima Laibow allows us to peer into the brain of a developing infant via brainwave patterns. We are not used to thinking about how brainwave patterns shift and change as infants grow and develop.
We are all used to thinking about human development by accomplishments at certain points in time: propping up on forearms at 4 months, rolling at 7 months, crawling at 9 months and walking at 12 months (Folio & Fewell, 2000, p.
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