Atypical behavior Pseudobulbar affect HP:0002193 Pseudobulbar behavioral symptoms UMLS:C4025720 Terminology has been varied and somewhat confusing, including involuntary emotional expression disorder, emotional lability, emotional dysregulation, pathological laughter and crying, emotional dysregulation, emotional incontinence, and emotionalism. PBA may be encountered in the setting of amyotrophic lateral sclerosis, extrapyramidal and cerebellar disorders (Parkinson disease, multiple system atrophy, progressive supranuclear palsy), multiple sclerosis, traumatic brain injury, Alzheimer disease and other dementias, stroke, and brain tumors. Pseudobulbar affect (PBA) is characterized by uncontrolled crying or laughing which may be disproportionate or inappropriate to the social context. Thus, there is a disparity between the patient's emotional expression and his or her emotional experience. Pseudobulbar behavioural symptoms Pseudobulbar signs