Prkachin, K M Nonverbal communication deficits and response to performance feedback in depression. [electronic resource] - Journal of abnormal psychology Jun 1977 - 224-34 p. digital Publication Type: Comparative Study; Journal Article ISSN: 0021-843X Standard No.: 10.1037//0021-843x.86.3.224 doi Subjects--Topical Terms: Acoustic StimulationAdolescentAdultAffectConditioning, ClassicalDepression--etiologyFacial ExpressionFeedbackFemaleHumansMental DisordersMiddle AgedPhotic Stimulation