“…Over the last decade, LENA has been used across many languages to study the links between the language input and language outcomes, to characterize specific language environments, to study clinical populations, and to provide linguistic feedback to caregivers (see the list of over 100 publications at www.lena.org/research/). Of the three primary LENA measures, CTC has recently received the most attention, as it is interpreted as a proxy for high-quality "serve and return" caregiver-child interactions, child engagement, and adult responsiveness, and thus a key component of high-quality language environments (Christakis, Lowry, Goldberg, Violette, & Garrison, 2019;Gilkerson et al, 2017Gilkerson et al, , 2018Perry et al, 2018;Zimmerman et al, 2009; see also http://lena.org/conversa tional-turns). In the present study, we take a closer look at this measure.…”