Both writers and readers experience auditory imagery of intonations, accents, and hesitations in written language, and some aspects of this "written language prosody" are made partially overt through punctuation. Two studies explored the relationship between written language prosody and punctuation. The first study asked people to read aloud and the second study asked them to repunctuate (insert punctuation marks in passages from which punctuation had been removed) written passages. Subjects for both studies were a group of college students and a group of adult education students. Analysis of the reading aloud task revealed that subjects who read aloud nearly always produced intonation units whose length lay within the normal range for ordinary spoken language. Further, the degree to which their segmentations matched the punctuation of a piece of writing provided an index of the degree to which that writing prosodically resembles speech. Findings of the repunctuation task indicated that those subjects came closer than oral readers to matching the punctuation of the original authors. This suggests that because writers and silent readers are able to process large chunks of information at a time and written language provides syntactic as well as punctuational clues to prosodic boundaries, original authors and repunctuators produce longer intonation units than do oral readers. Differences between open and closed punctuation styles and grammatical sites where people tend to insert or delete punctuation contrary to arbitrary "rules" may also be analyzed in light of these findings. (SKC)