A need exists to address how the availability of digital platforms plays a role in collaborative writing. Further, interest has emerged to understand heritage language (HL) learners’ writing as a result of task-based peer interactions with either second language (L2) or HL learners across face-to-face (FTF) and synchronous computer-mediated communication (SCMC) modes. However, it remains unknown how pair type and interaction mode can influence advanced learners’ lexical performance on written texts through measures of lexical richness. Therefore, this study tested 13 HL–L2 and 16 HL–HL dyads enrolled in advanced Spanish content courses who completed two writing tasks across FTF and SCMC modes. The writing tasks consisted of the hiring (Task A) and laying off (Task B) of an individual for known Spanish companies. The written texts were analyzed for lexical richness through lexical density, lexical sophistication, and lexical diversity indices. The main results revealed that the HL–L2 pairs significantly produced a higher ratio of lexical density in their written texts. No significant results were found for lexical diversity or lexical sophistication across pair types and interaction mode. These results imply that HL–L2 pairs distinguished the register of the writing task more so than HL–HL pairs.

Variation in the language experience of bilinguals has consequences for cognitive and affective processes. In the current study, we examined how bilingual experience influences the relationship between language and emotion in English among a group of Spanish–English heritage bilinguals on an emotion–memory task. Participants rated the emotionality of English taboo, negative and neutral words and then completed an unexpected recognition test. To account for language experience, data were gathered on the participants’ language dominance and proficiency. Results showed emotion–memory effects in the Spanish–English heritage bilinguals’ English (the societal language): taboo words were recognized significantly better than neutral words, while the emotionality of negative words carried over and significantly affected the recognition of preceding neutral words. Furthermore, such effects were modulated by language dominance scores with more pronounced emotion–memory effects in more English-dominant bilinguals. The findings contribute to a growing body of evidence showing that emotions are not necessarily restricted to the first acquired home language. Critically, for heritage speakers, there is often a shift in language dominance from the home language to the societal language. The present study demonstrates that the effects of emotion on memory are seen in the acquired societal language.