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Mirth, laughter and gelastic seizures
S Arroyo1, R P Lesser, B Gordon
1Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD.
Brain : a Journal of Neurology
|August 1, 1993
Summary
This study investigated the brain mechanisms behind laughter and mirth using three patients with gelastic seizures. Findings suggest distinct brain regions contribute to the motor act of laughter and its emotional experience.
Area of Science:
- Neuroscience
- Neurology
- Clinical Neurophysiology
Background:
- The neural pathways underlying mirth and laughter are not well understood.
- Gelastic seizures, characterized by unprovoked laughter, offer a unique window into these mechanisms.
Observation:
- Three patients with gelastic seizures were studied, with laughter elicited via cortical electrical stimulation.
- One patient experienced laughter without mirth, originating from the left anterior cingulate gyrus.
- Two patients exhibited laughter with mirth from temporal lobe stimulation, specifically the fusiform and parahippocampal gyri.
Findings:
- Electrical stimulation of the anterior cingulate gyrus may be linked to the motor execution of laughter.
- Stimulation of the basal temporal cortex (fusiform and parahippocampal gyri) is associated with the emotional experience of mirth.
- These findings highlight the distinct roles of the cingulate and basal temporal cortices in human laughter.
Implications:
- The study suggests a neuroanatomical basis for differentiating the motor and emotional components of laughter.
- Understanding these pathways could inform treatments for disorders involving laughter and emotional processing.
- Further research is warranted to fully elucidate the complex neural circuitry of human mirth and laughter.