Humans 5 Language Phonetics 5 article 5 female 5 human 5 human experiment 5 language 5 male 5 phonetics 5 vowel Adult 4 Speech Perception 4 adult 4 learning 4 speech perception 4 Female 3 Learning 3 Male 3 Multilingualism 3 multilingualism 3 Infant 2 Language Development 2 Spanish 2 Young Adult 2 bilingualism 2 controlled study 2 infant 2 language development 2 speech 2