Before revision: Automatic emotions recognition and Major Depressive Disorder (MDD) diagnosis are inherently challenging problems in health informatics applications. According to the World Health Organization, 300M people are affected by depression in 2017 with only the third of them correctly identified. MDD is a permanent mood disorder where the patient constantly feels negative emotions (low Valence) and lacks excitement and interest (low Arousal).
After revision: Automatic emotions recognition and Major Depressive Disorder (MDD) . MDD describes the constant expression of certain emotions: negative emotions (low Valence) and lacks excitement and interest (low Arousal).