Monday, February 15, 2010

Sneezing at the sun

From the consequential to the less so...

About a quarter of humanity will sneeze after being in the dark and then being exposed to the sun. Why we do this has yet to be understood, and, really, hasn't had much investigation, for understandable reasons. In this week's PLOS One, investigators from Switzerland tried to figure this out. In a simple experiment, they took ten known 'photic sneezers' and matched them by age and sex with non-photic sneezers. They then showed them a checkerboard display or a bright photic stimulus, and measured their electroencephalogram patterns.

Their findings? Photic sneezers, when exposed to a bright stimulus, had increased excitability of the visual cortex, not in the brainstem or lower centers of the brain, meaning that higher brain controls are responsible for this, not reflexive controls. Why some people photic sneeze and others don't and what this means in terms of neural pathways, remains unclear. Most importantly of all, however, I just learned that there is a proposed ACHOO acronym, meaning Autosomal Cholinergic Helio-Ophtalmologic Outburst, signifying the powers of acryonyms to confuse people even more.

Nicolas Langer*, Gian Beeli, Lutz Jäncke (2010). When the Sun Prickles Your Nose: An EEG Study Identifying Neural Bases of Photic Sneezing PLOS One

2 comments:

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  2. I've had HEPATITIS B problem over 4 years. I tried everything, of course I went to the doctor. about a hundred times, and though about my Family, I know my Family will face a serious problem when I’m gone, I lost hope and I wept all day, but one day I was surfing the internet I found Dr.Suku contact number. I called him and he guided me. I asked him for solutions and he started the remedies for my health. Thank God, now everything is fine, I’m cured by Dr. Suku herbal medicine, I’m very thankful to Dr. Suku and very happy with my hubby and family.his email greatsukusolutiontemple@hotmail.com or contact his hot line:+2348074839242 so any type of disease HIV/AIDS,CANCER, ALS, Hepatitis C, PCV.. HERPES,through his via email;greatsukusolutiontemple@hotmail.com.

    ReplyDelete