Depression. A meta-analysis of emotion responses which included facial expressions has been undertaken in depression by ▇▇▇▇▇▇ et al (2008). The meta-analysis included seven studies which measured facial expressivity using either EMG or observational coding. It showed that people with major depressive disorder demonstrate reduced emotional reactivity to both positively and negatively valenced stimuli, with the reduction larger for positive stimuli (d=.53) than for negative stimuli (d=.25). Since the meta-analysis by ▇▇▇▇▇▇ et al (2008), two further studies investigating facial expressivity in depression have been published and are described below.
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