article human 1,164 female 643 adult 630 male 623 Humans 521 human experiment 520 controlled study 424 major clinical study 257 Female 240 Male 228 Adult 170 nonhuman 158 clinical article 144 child 136 adolescent 124 young adult 121 perception 107 learning 105 questionnaire 103 Young Adult 101 Adolescent 100 psychology 97 education 94 procedures 91 physiology 90 middle aged 80 decision making 78 qualitative research 78 Middle Aged 75