This article memorializes Robert E. Thayer (1935-2014). He was an internationally recognized leader in research into human mood, with influence inside and outside of the academy. In articles and books he advanced our understanding of the bases of human moods and the role mood plays in everyday life. His seminal work examined the biopsychology of mood, including a range of factors such as energy, tension, and arousal. He also developed a mood-related measure, the Activation-Deactivation Adjective Check List (1964).
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