sentences:  Vygotsky investigated child development and how this was guided by the role of culture and interpersonal communication.Vygotsky observed how higher mental functions developed through social interactions with significant people in a child's life, particularly parents, but also other adults.Through these interactions, a child came to learn the habits of mind of her/his culture, including speech patterns, written language, and other symbolic knowledge through which the child derives meaning and affects a child's construction of his or her knowledge.