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Seasonal Affective Disorder: An Introduction

topic. The interest stems from two viewpoints. First, the syndrome of seasonal affective disorder (SAD) (winter type) presents a rare instance of a major psychiatric illness that is readily susceptible to treatment. Moreover, the treatment (phototherapy) is attractive to clinicians and patients alike because it is noninvasive and not drug-based. Second, the suggestion that the syndrome may be related to the wellstudied seasonal phenomena in animals has attracted the attention of researchers interested in exploring animal models of human psychiatric conditions, in the hopes of developing an adequate description of the etiology of the syndrome. In 1987, Mary Blehar and Norman Rosenthal of the U.S. National Institute of Mental Health (NIMH) organized an unusual workshop on the topic of SAD at the