Cognition and depression

Depression can have the following cognitive effects

Apperception has a characteristic negative evaluative quality to it and the Sensorium is impaired
 * Consciousnessis dulled.
 * In depression there are disturbances in suggestibility and people can become more compliant compliant and uncritical, or alternatively more resistant and negative

Affect: observed expression of emotion; may be inconsistent with patient's description of emotion
 * Emotion is affected
 * Inappropriate affect: disharmony between the emotional feeling tone and the idea, thought, or speech accompanying it
 * Blunted affect: a disturbance in affect manifested by a severe reduction in the intensity of externalized feeling tone
 * Restricted or constricted affect: reduction in intensity of feeling tone less severe than blunted affect but clearly reduced
 * Flat affect: absence or near absence of any signs of affective expression; voice monotonous, face immobile
 * Labile affect: rapid and abrupt changes in emotional feeling tone, unrelated to external stimuli.