The Concept of Anxiety
The Concept of Anxiety (): "A Simple Psychologically Orienting Deliberation on the Dogmatic Issue of Hereditary Sin", is a philosophical work written by Danish philosopher Søren Kierkegaard in 1844. The original 1944 English translation by Walter Lowrie (now out of print), had the title The Concept of Dread. "The Concept of Anxiety" was dedicated "to the late professor Poul Martin Møller". He used the pseudonym Vigilius Haufniensis (which, according to Kierkegaard scholar Josiah Thompson, is the Latin transcription for "the Watchman" of Copenhagen) for "The Concept of Anxiety".
Anxiety sensitivity
In 1984 Steven Reiss wrote the 16 items on the brief questionnaire he called and copyrighted as the "Anxiety Sensitivity Index" (ASI). In 1986 Reiss, Peterson, Gursky, & McNally published the ASI questionnaire along with initial validity evidence. As of July, 2013, the ASI has been used in more than 1,600 research studies. As was predicted by Reiss and McNally (1985), a high score on the ASI is a powerful and unique predictor of who will have panic attacks, post-traumatic stress, and ordinary fears or phobias.