Humans 3 Vagus Nerve human 3 physiology 3 vagus nerve 3 Female 2 controlled study 2 female 2 psychology 2 randomized controlled trial 2 vagus nerve stimulation 2 Adolescent 1 African American 1 African Americans 1 Autonomic Nervous System 1 Child 1 Child Care 1 Electrocardiography 1 Electroencephalography 1 Health Status Disparities 1 Heart Rate 1 Infant 1 Male 1 Mother-Child Relations 1 Mothers 1 Object Attachment 1 Respiratory Sinus Arrhythmia 1 Single-Blind Method 1 Stereotype threat 1 Stereotyping 1