article controlled study human learning Humans 20 human experiment 19 female 17 male 17 adult 16 Learning 13 Female 7 Male 6 clinical article 6 attention 4 electroencephalogram 4 major clinical study 4 physiology 4 Adult 3 Attention 3 Brain 3 Individual differences 3 Memory 3 Motor Skills 3 Young Adult 3 brain 3 memory 3 motor performance 3 nuclear magnetic resonance imaging 3 prediction 3 skill 3