Conditioning, Classical 6 Fear 6 Fear conditioning conditioned reflex 6 controlled study 6 fear 6 male 6 adult 5 female 5 Article 4 Humans 4 electrodermal response 4 human 4 Male 3 fear conditioning test 3 human experiment 3 memory 3 physiology 3 Animals 2 Behavior, Animal 2 Extinction, Psychological 2 Female 2 Galvanic Skin Response 2 Memory 2 acute stress 2 animal 2 animal behavior 2 animal experiment 2 animal tissue 2 article 2