Psychophysiology; Affective neuroscience; Emotion; Gender differences; Autonomic nervous system; Respiration; Circumplex model; Anxiety disorder; Fear; Sadness; Mental stress; Heart rate variability; Sympathetic nervous system; Parasympathetic nervous system; Electrodermal system; Cardiovascular system; Impedance cardiography; Pre-ejection period; Respiratory sinus arrhythmia; Defense cascade