Does omitting the accent mark in a word affect sentence reading? Evidence from Spanish

Lexical stress in multisyllabic words is consistent in some languages (e.g., first syllable in Finnish), but it is variable in others (e.g., Spanish, English). To help lexical processing in a transparent language like Spanish, scholars have proposed a set of rules specifying which words require an accent mark indicating lexical stress in writing. However, recent word recognition using that lexical decision showed that word identification times were not affected by the omission of a word's accent mark in Spanish. To examine this question in a paradigm with greater ecological validity, we tested whether omitting the accent mark in a Spanish word had a deleterious effect during silent sentence reading. A target word was embedded in a sentence with its accent mark or not. Results showed no reading cost of omitting the word's accent mark in first-pass eye fixation durations, but we found a cost in the total reading time spent on the target word (i.e., including re-reading). Thus, the omission of an accent mark delays late, but not early, lexical processing in Spanish. These findings help constrain the locus of accent mark information in models of visual word recognition and reading. Furthermore, these findings offer some clues on how to simplify the Spanish rules of accentuation.