: Involuntary or inappropriate laughing can be a symptom of Pseudobulbar affect (PBA) , a condition resulting from neurological injuries or diseases.
: Humans are more likely to laugh in the presence of others. It acts as an invitation to share emotional states and signals non-aggressive intent. laughing
: During laughter, the abdominal muscles contract quickly, increasing pressure in the chest cavity and expelling air audibly. : Involuntary or inappropriate laughing can be a