Adult Humans 8 Language adult 8 human 8 language 8 Learning 5 female 5 learning 5 male 5 Child 4 Female 4 Male 4 child 4 physiology 4 Linguistics 3 Visual Perception 3 article 3 human experiment 3 vision 3 Adolescent 2 Knowledge 2 Language Development 2 Speech 2 Verbal Learning 2 Word learning 2 adolescent 2 controlled study 2 knowledge 2 language development 2