“…The few studies that focus on facial EMG activity in depression demonstrate that individuals with clinical and subclinical depression respond with increased activity of the corrugator supercilii muscle to unhappy expressions (Sloan, Bradley, Dimoulas, & Lang, 2002), unpleasant images (Sloan, Strauss, & Wisner, 2001), and sad imagery (Schwartz, Fair, Salt, Mandel, & Klerman, 1976), just as do nondepressed control participants. However, in comparison to nondepressed participants, individuals with clinical and subclinical depression do not show an increased activity of the zygomaticus major muscle in response to happy expressions (Sloan et al, 2002), pleasant images (Sloan et al, 2001), and happy imagery (Schwartz et al, 1976).…”