Task: Text Categorization
Input (English): Lev Vygotsky criticized one of this man's theories by stating that syncretism is a useful means of experimentation, while David Elkind extended this man's concept of hypothetico-deductive reasoning to the imaginary audience and personal fable phenomena. This man collaborated with Barbel Inhelder to ask the subjects of one study to identify a doll's perspective of three mountains. He posited that equilibration is the balance achieved between (*) accommodation and assimilation, processes used to organize knowledge into schemas. The subjects of this man's most famous theory realize object permanence during the sensorimotor stage and are less egocentric by the concrete operational stage. For 10 points, name this Swiss psychologist who created genetic epistemology and formulated a four-stage theory of child cognitive development.
Output (English): Social Science