The phenomenon of laughter involves various physical reactions, such as changes in breathing, muscle contractions, and altered reflexes. While its evolutionary origin remains uncertain, researchers believe it might have initially signaled friendly intent in social play among primates. Laughter's contagious nature is linked to its role in conveying emotions within human social groups, activating brain regions associated with positive responses. The complexity of laughter's functions expanded as humans developed larger social groups and advanced language abilities.
Vocabulary:
• Laughter: The sound produced by laughing.
• Vocalize: To produce sounds with the voice.
• Contagious: Capable of being transmitted from person to person.
• Activate: To make something start working or functioning.
• Convey: To communicate or express.
• Intent: Purpose or plan.
• Hypothesize: To suggest an explanation based on limited evidence.
• Contemporaries: People or things existing or occurring at the same time.
• Amused: Finding something funny or entertaining.
Source: TED-Ed