vocabulary human 55 Humans 50 male 45 female 44 Vocabulary 39 child 33 Female 32 Male 32 article 32 human experiment 32 language 29 language development 26 Child 24 adult 21 Language 20 preschool child 20 Child, Preschool 18 physiology 18 controlled study 15 Language Development 14 Adult 13 learning 13 major clinical study 13 reading 13 Adolescent 12 Child Language 12 Multilingualism 12 adolescent 12 comprehension 12