Electric current stimulates laughter

@article{Fried1998ElectricCS,
  title={Electric current stimulates laughter},
  author={I. Fried and Charles L. Wilson and K. MacDonald and E. Behnke},
  journal={Nature},
  year={1998},
  volume={391},
  pages={650-650}
}
Speech and laughter are uniquely human. Although there is considerable information on the neuronal representation of speech, little is known about brain mechanisms of laughter. Here we report that electrical stimulation in the anterior part of the human supplementary motor area (SMA) can elicit laughter. This area is also involved in the initiation of speech and has been shown to have increased activity in people who stutter. 
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