Worry and its psychological disorders

"Once considered synonymous with the cognitive components of anxiety (Mathews, 1990; O'Neill, 1985), worry has emerged as a more specific construct that can not only be distinguished from a larger subset of cognitive aspects of anxiety, but also studied in its own right (Davey, 1993; Davey, Hampton, Farrell & Davidson, 1992; Zebb & Beck, 1998)."