Word length and frequency effects on text reading are highly similar in 12 alphabetic languages

Reading research robustly finds that shorter and more frequent words are recognized faster and skipped more often than longer and less frequent words. An empirical question that has not been tested yet is whether languages within the same writing system would produce similarly strong length and frequency effects or whether typological differences between written languages would cause those effects to vary systematically in their magnitude. We analyzed text reading eye-movement data in 12 alphabetic languages from the Multilingual Eye-Movement Corpus (MECO). The languages varied substantially in their word length and frequency distributions as a function of their orthographic depth and morpho-syntactic type. Yet, the effects of word length and frequency on fixation durations and skipping rate were highly similar in size between the languages. This finding suggests a high degree of cross-linguistic universality in the readers’ behavioral response to linguistic complexity (indexed by word length) and the amount of experience with the word (indexed by word frequency). These findings run counter to influential theories of single word recognition, which predict orthographic depth of a language to modulate the size of these benchmark effects. They also facilitate development of cross-linguistically generalizable computational models of eye-movement control in reading.