TY - JOUR AU - Ko, Eon-Suk AU - Jo, Jinyoung AU - On, Kyung-Woon AU - Zhang, Byoung-Tak PY - 2020 M3 - Original Research TI - Introducing the Ko Corpus of Korean Mother–Child Interaction JO - Frontiers in Psychology UR - https://www.frontiersin.org/articles/10.3389/fpsyg.2020.602623 VL - 11 SN - 1664-1078 N2 - We describe a corpus of speech taking place between 30 Korean mother–child pairs, divided in three groups of Prelexical (M = 0;08), Early-Lexical (M = 1;02), and Advanced-Lexical (M = 2;03). In addition to the child-directed speech (CDS), this corpus includes two different formalities of adult-directed speech (ADS), i.e., family-directed ADS (ADS_Fam) and experimenter-directed ADS (ADS_Exp). Our analysis of the MLU in CDS, family-, and experimenter-directed ADS found significant differences between CDS and ADS_Fam, and between ADS_Fam and ADS_Exp, but not between CDS and ADS_Exp. Our finding suggests that researchers should pay more attention to controlling the level of formality in CDS and ADS when comparing the two registers for their speech characteristics. The corpus was transcribed in the CHAT format of the CHILDES system, so users can easily extract data related to verbal behavior in the mother–child interaction using the CLAN program of CHILDES. ER -