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Labile Affect

Pathological emotional expression, generally due to neurological degeneration or other complications; may or may not be mood-congruent. In other words, the patient might sob uncontrollably in an only moderately sad situation (an excessive but mood-congruent reaction), or he or she might also cry when upset or angry (a mood-incongruent reaction). Labile affect is also known as pseudobulbar affect, emotional incontinence, or involuntary emotional expression disorder (IEED).

Example: In describing her marriage, a woman is sobbing bitterly one moment, then laughing wildly the next.

Labile Affect
APA Reference
Grinnell, R. (2016). Labile Affect. Psych Central. Retrieved on September 16, 2018, from https://psychcentral.com/encyclopedia/labile-affect/