title: Comments on:non-associative fear acquisition: a review of the evidence from retrospective and longitudinal research.
authors.forename: Ronald A
authors.initials: RA
authors.lastname: Kleinknecht
mesh_terms: D003213:Conditioning, Psychological; D006801:Humans; D008137:Longitudinal Studies; D010698:Phobic Disorders / Q000209:etiology*; D011582:Psychological Theory; D012189:Retrospective Studies