Anderson, R. C. & Hidde, J. L. (1971). Imagery and sentence learning. Journal of Educational Psychology, 62(6), 526-530.

Twenty-four subjects, who told they were helping norm materials for a future experiment, either rated the pronunciability or the image-evoking value of 30 sentences. After one presentation of the sentences, a surprise test was administered in which the subject attempted to recall the verb and object of each sentence given the subject noun as a retrieval cue. Subjects who rated imagery recalled over three times as many words as those who rated pronunciability. It is argued that imagery instructions facilitated learning by causing subjects to process the sentences in a meaningful fashion.