male human 231 female 220 Humans 179 adult 175 Male 139 Female 130 controlled study 92 Adult 89 Article 86 article 77 human experiment 74 physiology 69 young adult 68 Young Adult 64 middle aged 44 major clinical study 43 adolescent 42 Adolescent 40 clinical article 37 psychology 37 aged 36 Middle Aged 34 procedures 34 diagnostic imaging 31 child 30 attention 27 Child 25 Attention 21 nuclear magnetic resonance imaging 21