Swedes in four different age groups (9, 12, 15 and 18 years) judged written words which varied in three dimensions: syntactic category, objective frequency, and polysemy (multiple meaning). The subjects judged ease of comprehension of 24 words in a factorial arrangement. The method used was Thurstone's paired comparisons. A predicted complex…

Consistent learning gains are associated with the use of pictures when experiments adhere to five ground rules: (1) prose passages are presented orally; (2) the subjects are children; (3) the passages are fictional narratives; (4) the pictures overlap the story content; and (5) learning is demonstrated by factual recall. (Author)