The core symptoms
The core symptoms of depression, of which at least one is required in DSM-IV, are depressed mood, and loss of interest or pleasure. The further eligible symptom in ICD-10 is decreased energy or fatigability, but, since two core symptoms must be present, in effect depressed mood or loss of interest/pleasure are required in this schema also. The reason for the addition of decreased energy to the core is not clear.
Psychiatric resident conceptualizations of mood and affect within the mental status examination. http://www.ncbi.nlm.nih.gov/pubmed/12900321/
- To explore the ways in which psychiatry residents conceptualize the terms "mood" and "affect," a 14-item questionnaire was sent to residency programs in New York.
- The questions consisted of possible definitions of mood and affect; all questions required a "true" or "false" response. Residents (N=99) were asked how they viewed mood and affect from a temporal perspective (i.e., sustained versus momentary) and in terms of an objective-subjective (or external-internal) dichotomy.
- There were inconsistencies in the temporal view of mood (said to be sustained by 60.6% and momentary by 50.5%) and affect ("pervasive" by 26.3% and "momentary" by 66.3%). Residents overwhelmingly defined mood as being subjective and internal and affect as being objective and external.