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Photic sneeze reflex
1
Transcript
HOW
WHY
WHEn
Photic
Sneeze Reflex
Genetic trait
How is it caused?
50 %
Theories:
History
Aristotle's hypothesis
Why does the heat of the sun provoke sneezing?
Hypothesis:
"Sun's heat caused sweating inside the nose, which triggered a sneeze in order to remove the moisture"
Hypothesis:
"Sun's light made the eyes water, and the tears proceeded to seep into the nose and irritate it, causing a sneeze."
Bacon's Hypothesis
Modern theory:
Involves:
Modern Theory
Trigeminal nerve
X
Optic nerve
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