Which is most important to include in a summary of this article? Some people sneeze in bright light when two nerves get their signals crossed. Experts think that the photic sneeze reflex (PSR) affects 10 to 35 percent of people. The trigeminal and optic nerves send electrical signals to the brain. Scholars in ancient Greece proposed an explanation for "sun sneezing" 2,000 years ago.

The most important information to include in a summary of this article is that some people experience sneezing in bright light due to the photic sneeze reflex (PSR), which is believed to impact 10 to 35 percent of the population. This reflex occurs when signals from the trigeminal and optic nerves become crossed, sending electrical signals to the brain and causing the sneezing response. Additionally, the article mentions that the phenomenon of "sun sneezing" was observed and proposed by scholars in ancient Greece around 2,000 years ago.

simple answer

Some people sneeze in bright light due to a reflex involving crossed signals from the trigeminal and optic nerves. It is believed to affect 10 to 35 percent of people and has been observed for centuries, with ancient Greek scholars proposing an explanation for the phenomenon.