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When people laugh, the most common sound is "ha", while some may "ho" or "he". When do people pick this up when they grow, or is this just natural?

Some people laugh differently again, but I tend to believe they are just acting, not naturally letting it out, just so they feel different from others. Is this true?

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The actual sound that is being represented by the grapheme ⟨a⟩ in laughter written as ⟨ha ha ha⟩ is the mid-cental vowel /ə/ en.wikipedia.org/wiki/Mid-central_vowel. People laugh with this sound when they laugh with a relaxed open mouth. While ⟨ha ha ha⟩ is probably the most common written representation of laughter, I don't know if it is indeed the most common form of laughter. Do you have data supporting your claim, or are you maybe misled by seeing laughter most often represented by those letters? –  what Mar 9 '14 at 18:30

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