Sometimes I, a full-grown adult, see a so-called lift-the-flap book, meant for babies and toddlers, and become almost tingly with the desire to feel those cardboard tabs under my fingers and discover what’s hidden behind each one. It makes me suspect that interactive board books hit some primal sweet spot — and literacy research, it turns out, backs up my instinct. Our brains evolved to seek out and benefit from “multisensory” experiences, especially when our cognitive abilities are still developing. Young children exposed to books that engage more than one sense tend to have better comprehension and enthusiasm for reading down the road.

Interactive books also stoke the desire to solve a mystery. Some hidden thing waits on every page. Peekaboo! Freud famously described the conceal-and-reveal game babies love as an attempt to master, through repetition, the emotional distress of a parent’s occasional disappearance, then reappearance. Sure, but let’s not forget the motivational power of plain old curiosity.

Readers of all ages: I am happy to present a new batch of interactive books that play masterfully with a baby’s or toddler’s — well, with all of our — desire to swing open that closed door, pull back that curtain, charge over to the other side of that hill to see what’s waiting there.

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Elsa Mroziewicz has followed up one terrific lift-the-flap book, “Peek-a-Who?,” with another, PEEK-A-WHO TOO? (Minedition, 16 pp., $11.99; ages 1 to 4). With simple but colorful and richly decorative illustrations a cut above the usual board-book art, both of these triangular-shaped books hide a different animal under large flaps. Each spread opens out from the center with flaps that lift either up or down to form two diamonds, and Mroziewicz uses the book’s unusual shape to position the creatures in interesting ways and add surprise: A crocodile’s jaw opens on either side, a monkey spreads his arms over his head, a hibernating bear reclines.