title: On the concepts of fear.
authors.affiliation: Department of Psychology, Harvard University, Cambridge, MA 02138, USA.
authors.forename: J
authors.initials: J
authors.lastname: Kagan
authors.forename: J
authors.initials: J
authors.lastname: Schulkin
mesh_terms: D000818:Animals; D003214:Conditioning, Classical; D005239:Fear / Q000502:physiology; D006803:Human Development; D006801:Humans; D007092:Imagination; D007223:Infant; D018730:Infant Behavior; D007323:Instinct; D011582:Psychological Theory