This study responds to the call for more ecologically valid psycholinguistic research (Spivey & Cardon, 2015) by examining how readers incidentally acquire multifaceted vocabulary knowledge while reading a long, authentic text. Using eye tracking, we explore how the processing of unfamiliar words changes with repeated exposure and how the repeated exposure and processing affect word learning. In two sessions, native and non-native English speakers read five chapters of an authentic English novel containing Dari words. After reading, participants received a comprehension test and three surprise vocabulary tests. Growth curve modeling revealed a non-linear decrease in reading times that followed an S shaped curve. Number of exposures was the strongest predictor of vocabulary learning (form and meaning), while total reading time independently contributed to the learning of word meaning. Thus, both quantity and quality of lexical processing aid incremental vocabulary development and may reveal themselves differently in readers’ eye movement records.

This study examined narrative and argumentative essays written over the course of a 4‐month semester by 37 students of English as a second language (ESL). The essays were analyzed for development over time and for genre differences. The goal of the study was to conceptually replicate previous studies on genre differences (e.g., Lu, 2011) and on short‐term linguistic development in the areas of syntactic complexity, accuracy, lexical complexity, and fluency (e.g., Connor‐Linton & Polio, ). In addition, the authors wanted to investigate whether native speakers exhibited similar genre differences in order to determine if the ESL students’ genre variations were developmental or related to functional differences between the genres. The results indicate strong genre differences in the area of linguistic complexity. There were limited changes over time on most measures and a notable lack of development in the area of accuracy. Parallel data from native speakers show genre variation on some but not as many of the measures. Although this study was motivated by research design concerns, it also has implications for theory (e.g., the source of genre differences) and pedagogy.

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