Humans 4 human learning Conditioning, Classical 3 conditioned reflex 3 physiology 3 Brain 2 Fear 2 Galvanic Skin Response 2 Learning 2 adult 2 article 2 association 2 brain 2 controlled study 2 electrodermal response 2 fear 2 fear conditioning test 2 female 2 human experiment 2 male 2 memory 2 outcome assessment 2 Action Potentials 1 Adult 1 Animals 1 Article 1 Association Learning 1 Associative learning 1 Cerebral Cortex 1