Research: Up to 35% of the world’s population sneezes after seeing bright light

August 31, 2023

Do you sneeze after seeing a bright light? Well, you’re not alone. In fact, according to researchers, 18%–35% of people worldwide are shining examples of what has jovially been labeled the ACHOO syndrome, reports My Modern Met.

Clinically known as the Photic sneeze reflex—and also, in popular usage, as autosomal dominant compelling helio-ophthalmic outburst (ACHOO syndrome)—the condition is characterized by successive sneezing induced by bright light. This is different from a normal sneeze, which is triggered by an infection or an irritant.

According to findings of a 1995 study, published in the Journal of the American Optometric Association, the majority of photic sneezers are female and white.

According to Scientific American, when those affected by the syndrome emerge from dim light into sunlight—or turn to face directly into the sun—the glare commonly triggers the sneeze reflex. The number of induced sneezes—which seems to be genetically mediated and can be predicted within a family—is constant from episode to episode and typically numbers two or three.

Records of ACHOO syndrome have been found as far back as 350 BCE. Unlike regular sneezes, which occur after the mucous membranes in our nose are irritated by particles, there is no physical trigger other than bright light. This can happen outdoors in the sunshine, or inside after turning on the light. “The reflex seems to be triggered by a change in intensity of light rather than a specific type or wavelength of light,” Dr. Annie Nguyen, an ophthalmologist with Keck Medicine of USC, says.

Although scientists know that ACHOO syndrome is genetic, they are still unsure what causes it. One previous theory suggests that bright light which makes the pupils constrict also irritates the nose. Another proposes that it’s due to higher sensitivity to visual stimuli.

Research contact: @mymodernmet

August 19, 2024

“Redshirting”—or choosing to delay school entry for a year—seems to be an increasingly popular trend among parents who are trying to give their children a competitive advantage, reports Yahoo Lifestyle.

The growing popularity of redshirting may have been started by Malcolm Gladwell’s bestselling book, Outliers, which was published in 2008. In this book, Gladwell claims that a child being relatively older than their peers provides an advantage.

Gladwell points to data showing that nearly all players for the Canadian Hockey League have birthdays in the first four months of the year. Because the cutoff for most sports in Canada is January 1, children born in the first four months of the year are older than the other children on the team—thus, making them more likely to be identified as talented and ultimately more likely to play professional hockey. Gladwell argues that this principle extends to children who are older than their classmates having an academic advantage as well.

Sincethis book was published, it seems that children are waiting longer and longer to start kindergarten every year. At the same time, kindergarten seems to be becoming increasingly academic and rigorous.

For parents of children born near the cutoff date, the pressure to delay kindergarten feels intense. So does research actually find that redshirting will provide an academic and/or social advantage for children? The answer may be more complicated than you think.

The research on redshirting

Research on redshirting suggests that it is associated with a small academic advantage (that is, higher academic test scores) and test scores that seem to increase at a greater rate in the first and second grades (suggesting that redshirted children are showing enhanced learning in these grades).

However, this effect may begin to fade as early as the end of first grade. This research is also correlational—meaning we do not know whether it is redshirting that causes these advantages or if redshirting is simply associated with advantages. The latter would not be surprising since parents that choose to redshirt their children are often very different from the parents who do not—most notably, they are often higher income families.

Some research studies eliminate the problem of parent choice by looking at the impact of children’s age within the same grade (such as comparing students with summer birthdays to students in the same grade with fall birthdays). Research finds that students who are relatively older than other children in their grade score higher on math and science tests and, although these differences decrease over the years, they are still present to some extent in eighth grade.

Other research finds that children who are relatively older show less hyperactivity and inattention and greater educational attainment (translation: getting farther in school). However, the impact on educational attainment is greatly reduced when schools do not engage in early tracking (translation: sending children to different schools based on academic abilities in elementary school).

Research also shows that children who are older relative to their classmates are more likely to be in gifted education and less likely to be in special education. These positive impacts seem to extend to high school and beyond.

Children who are older relative to their classmates are also less likely to drop out of high school, less likely to commit a felony, and less likely to experience a teenage pregnancy. Children who are older than their classmates also are more likely to attend a four-year college than younger students.

Yet, it is very important to note that this line of research only involves associations (meaning, we do not know whether being older relative to your peers actually causes any of these positive or negative outcomes). Further research is needed in order to conclude that redshirting actually causes any of these positive outcomes.

Are there any situations in which parents may want to avoid redshirting?

So, research suggests that being older than your peers is consistently associated with at least a small advantage—but are there any situations in which parents might want to avoid redshirting?

Research suggests that when your child has an identified disability, a suspected disability—or even if you are just concerned that they may need some extra help in school—you may want to avoid redshirting. In this case, delaying school entry may be associated with worse academic performance, because it would also involve delaying free essential services through the public school system (such as speech therapy and learning support).

This short delay may have a big impact as research finds that services before age five are more effective in improving a child’s long-term outcome than services after age five.

Research has compared the impact of redshirting on children with disabilities (such as autism, developmental delays, learning disabilities, or health impairments) versus children without disabilities. Researchers found that children with disabilities who were redshirted scored significantly lower in math in third grade when compared to children with disabilities who were not redshirted, while children without disabilities who were redshirted showed improved math and reading scores in third grade. Research also finds a negative impact of redshirting for children with more severe ADHD and no impact for children with learning disabilities.

Is redshirting more important for boys than girls?

In any discussion of redshirting, it is commonly assumed that boys in particular benefit from redshirting. In line with this assumption, research reveals that boys are indeed more likely to be redshirted than girls. So is there any research to back up this trend?

Research does find that girls are more likely to be ready for kindergarten than boys and that this difference is mostly driven by differences in social-emotional development.

Research also suggests that boys seem to show greater gains from redshirting and that boys may not cope as well as girls with having higher-achieving classmates.

Research contact: @yahoolifestyle0