Among infiuential explanations of why preschoolers are so drawn to pretending, Freud's psychoanalytic theory and Piaget's cognitive theory held sway for much of the twentieth century.
( ( Among ( ( infiuential explanations ) ( of ( why ( preschoolers ( ( are so ) ( drawn ( to pretending ) ) ) ) ) ) ) ) ( , ( ( ( ( ( Freud 's ) ( psychoanalytic theory ) ) and ) ( ( Piaget 's ) ( cognitive theory ) ) ) ( ( ( held sway ) ( for ( much ( of ( the ( twentieth century ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Among) (NP (NP (JJ infiuential) (NNS explanations)) (PP (IN of) (SBAR (WHADVP (WRB why)) (S (NP (NNS preschoolers)) (VP (VBP are) (ADVP (RB so)) (VP (VBN drawn) (PP (TO to) (NP (NN pretending)))))))))) (, ,) (NP (NP (NP (NNP Freud) (POS 's)) (JJ psychoanalytic) (NN theory)) (CC and) (NP (NP (NNP Piaget) (POS 's)) (JJ cognitive) (NN theory))) (VP (VBD held) (NP (NN sway)) (PP (IN for) (NP (NP (RB much)) (PP (IN of) (NP (DT the) (JJ twentieth) (NN century)))))) (. .)))
Freud's psychoanalytic theory and Piaget's cognitive theory were largely ignored and disproven in the twentieth century.
( ( ( ( ( Freud 's ) ( psychoanalytic theory ) ) and ) ( ( Piaget 's ) ( cognitive theory ) ) ) ( ( ( were largely ) ( ( ( ignored and ) disproven ) ( in ( the ( twentieth century ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (NNP Freud) (POS 's)) (JJ psychoanalytic) (NN theory)) (CC and) (NP (NP (NNP Piaget) (POS 's)) (JJ cognitive) (NN theory))) (VP (VBD were) (ADVP (RB largely)) (VP (VBN ignored) (CC and) (VBN disproven) (PP (IN in) (NP (DT the) (JJ twentieth) (NN century))))) (. .)))