adult 2 article controlled study 2 female 2 human 2 human experiment 2 learning 2 male 2 Adolescent 1 Adult 1 Biological Evolution 1 Female 1 Humans 1 Indexical effects 1 Language 1 Language Development 1 Learning 1 Male 1 Mental lexicon 1 Speech 1 Speech Perception 1 Spoken word recognition 1 Visual Perception 1 Visual world paradigm 1 Word learning 1 Young Adult 1 adolescent 1 evolution 1 evolutionary adaptation 1 evolutionary adaptation of cognitive mechanisms 1