sentences:  He thought egocentric speech would later develop into a fully mature and effective speech after a child gains a fair amount of cognitive and communicative skills.In "Thought and Language", Vygotsky argued that egocentric speech was a part of normal development of communication, self-guidance, self-regulation of behavior, planning, pacing, and monitoring skills.Vygotsky explains that private speech stems from a child's social interactions as a toddler, then reaches a peak during preschool or kindergarten when children talk aloud to themselves.