title: On negativism.
mesh_terms: D000374:Aggression / Q000523:psychology; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007207:Individuation; D007223:Infant; D007231:Infant, Newborn; D007804:Language Development; D008297:Male; D010553:Personality Development; D002666:Psychology, Child