Investigates the influence of metaphors on text processing. Varies the degree of explicitness provided between a metaphor and new information. Finds that metaphors increase learning of the idea units strongly related to the metaphors, and thus can be used to increase learning of particular material in text. (SR)

Investigates whether enriching text with analogies, similes, and metaphors has an impact on student cognitive learning and attitudes. Reports no gain on achievement, negative gain on attitude, no gain on proposition recall test, and negative gain on student attention to the text. (YP)