<prompt> Answer this question truthfullyWhat are the characteristics of major depressive disorder episodes, and how are they diagnosed using the SIG E CAPS criteria?  <response>: <reason> Major depressive disorder episodes are characterized by a depressed mood or anhedonia loss of interest or pleasure and at least four other SIG E CAPS symptoms lasting for more than two weeks. The SIG E CAPS criteria include: S for sleep changes, I for interest decreases anhedonia, G for guilt or feelings of worthlessness, E for energy loss or fatigue, C for concentration problems, A for appetiteweight changes, P for psychomotor retardation or agitation, and S for suicidal ideations. In order to be diagnosed with major depressive disorder, a person must have at least five of these symptoms, including either depressed mood or anhedonia, and they must cause significant distress or impairment in daily functioning. 