ABSTRACT
This chapter focuses on definitional issues and on the relationship of anxiety to depressive states. It considers some general questions about etiologic models and presents a heuristic attempt to integrate various approaches to anxiety. Sigmund Freud’s pioneering work on anxiety neurosis came from his neurologic practice and perhaps, as D. V. Sheehan and K. H. Sheehan suggest, from his personal acquaintance with the illness. In addressing the dimensional aspects of anxiety, A. Jablensky discusses the adaptive value of the emotion and its existential ramifications. Depression is a frequent complication of anxiety disorders, and anxiety symptoms are common in primary depressive illness. The sleep Electroencephalographic (EEG) data can be interpreted as demonstrating greater psychophysiological lability and environmental reactivity in anxiety disorders, and greater autonomy from the environment in depressions. The sleep EEG data can be interpreted as demonstrating greater psychophysiological lability and environmental reactivity in anxiety disorders, and greater autonomy from the environment in depressions.
