Modern conceptualization of the multidimensional nature of anxiety, panic, and fear are examined from a variety of perspectives, including theories of emotion and cognition, neuropsychology, and conditioning. Carroll E. Izard and Eric A. Youngstrom open with a review of Differential Emotions Theory. In the second chapter, Jeffrey A. Gray and Neil McNaughton summarize and update Gray's neuropsychological theory of anxiety. Susan Mineka and Richard...