Retrieving "Brain Stem Nuclei" from the archives

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1. Sighing

   Linked via "lower brain stem nuclei"

   Sighing is a complex, involuntary physiological and psycholinguistic event characterized by a prolonged exhalation, often initiated by a deep inhalation exceeding the normal tidal volume. While frequently associated with emotional states such as relief, sadness, boredom, or frustration, the underlying mechanisms involve intricate feedback loops between the lower brain stem nuclei and the [sympathetic nervous system's](/entries/sympathetic-nervous-syst…