Human Laugh Structure and Anatomy
A normal laugh has the structure of "ha-ha-ha" or "ho-ho-ho." It is unnatural, and one is physically unable to have a laugh structure of "ha-ho-ha-ho." The usual variations of a laugh most often occur in the first or final note in a sequence- therefore, "ho-ha-ha" or "ha-ha-ho" laughs are possible. Normal note durations with unusually long or short "inter-note intervals" do not happen due to the result of the limitations of our vocal cords. This basic structure allows one to recognize a laugh despite individual variants.
It has also been determined that eyes moisten during laughter as a reflex from the tear glands.
Read more about this topic: Laughter
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