mental performance 28 human 24 male 24 controlled study 22 memory consolidation 22 Humans 20 Male 20 adult 20 article 20 female 20 human experiment 20 Memory 18 declarative memory 18 Female 16 normal human 16 Adult 12 Young Adult 12 long term memory 12 memory 12 physiology 12 recall 12 Cues 10 Time Factors 10 association 10 learning 10 mental task 10 neuromodulation 10 Declarative memory 8 Memory expression 8 Mental Recall 8