Science Weekly The science of laughing
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Dec 10, 2024 
Sophie Scott, a professor of cognitive neuroscience at University College London, dives into the fascinating world of laughter. She reveals how laughter serves various social functions, enhancing bonding among humans and animals. Sophie discusses its contagious nature and the differences between voluntary and involuntary laughter, shedding light on the neurobiology behind this joyful expression. The conversation highlights the evolutionary importance of laughter and its potential to improve our well-being.
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Mechanics of Laughter
- Laughter is a non-verbal emotional vocalization produced by large contractions of intercostal muscles.
- It's a primitive way of making a sound by squeezing air out, causing the "ha ha" sound.
The Breathlessness of Laughter
- Laughing involves squeezing air out, sometimes making it hard to breathe.
- Human laughter differs from other apes, who laugh on both exhalation and inhalation.
The Chemical Benefits of Laughter
- Laughter reduces adrenaline and cortisol (stress hormones), leading to relaxation.
- It also increases endorphin uptake, acting like natural painkillers and creating a pleasant feeling.