Conditioning, Classical 2 Fear 2 Galvanic Skin Response 2 Humans 2 adult 2 conditioned reflex 2 controlled study 2 electrodermal response 2 fear fear conditioning test 2 female 2 human 2 learning male 2 memory 2 physiology 2 Adult 1 Article 1 Association Learning 1 Brain 1 Emotion 1 Fear conditioning 1 Fear learning 1 Female 1 Learning 1 Magnetic Resonance Imaging 1 Male 1 Memory 1 Mnemonic discrimination 1 PTSD 1