When you're reading a picture book to a very young child, it's easy to think it's obvious what picture, or part of a picture, is being talked about. But you know what all the words mean. It's not so easy when some of the words are new to you, and the open pages have more than one picture. A recent study has looked at the effect on word learning of having one vs two illustrations on a 2-page open spread.
The study, in two experiments, involved the child being read to from a 10-page storybook, which included two novel objects, mentioned four times, but only incidentally. In the first experiment, 36 preschoolers (average age 3.5 years) were randomly assigned to one of three conditions:
- one illustration (the illustration filled the page, with the text written as part of the illustration, and the opposing page blank)
- two illustrations (each illustration filled its page, on opposing pages)
- one large illustration (the page was twice the size of that found in the other conditions) — this was the control condition.
Children who were read stories with only one illustration at a time learned twice as many words as children who were read stories with two or more illustrations. There was no difference in reading time, or in the child’s enjoyment of the story.
In a follow-up experiment, 12 preschoolers were shown the two-illustration books only, but this time the reader used a simple hand swipe gesture to indicate the correct illustration before the page was read to them. With this help, the children learned best of all.
In fact, the rate of word learning in this last condition was comparable to that observed in other studies using techniques such as pointing or asking questions. Asking questions is decidedly better than simply reading without comment, and yet this simple gesture was enough to match that level of learning.
Other studies have shown that various distractions added to picture books, like flaps to lift, reduce learning. All this is best understood in terms of cognitive load. The most interesting thing about this study is that it took so little to ameliorate the extra load imposed by the two illustrations.
Also see https://blogs.sussex.ac.uk/psychology/2016/10/24/how-storybook-illustrat... for a blog post by one of the researchers
 . Two sides to every story: Children learn words better from one storybook page at a time. Infant and Child Development [Internet]. Submitted :n/a - n/a. Available from: http://onlinelibrary.wiley.com/doi/10.1002/icd.2047/abstract