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Natural Light and Circadian Vision

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What an eye-opening concept. On Thursday, Joel Loveland of the Seattle Daylighting Lab reminded a crowd of aspiring architects and planners at Berkeley of the importance of natural light... and on how much we still have to learn.

For example: did you know that there's more to vision than rods and cones?

 
 

Prof. Loveland had a great way of thinking about light quality and window type (including a good explanation for why the windows in so many modern buildings are unsatisfying and unattractive), and in the future, you can look for a series of posts on that topic.

But for today, we thought we'd share one exciting tidbit from the talk: the concept of circadian vision. Apparently, and we're just paraphrasing the experts here, so correct us if we're mistaken, your retina actually has two layers. Light passes through the outer layer to hit the rods and cones—if you remember biology class, that's where color and black and white vision happens. But on this newly discovered outer layer, other receptors take note of the color and quality of light at dawn and dusk, and adjust your body clock accordingly.

We've always been big fans of natural light and windows, especially after suffering two stifling years in a completely windowless middle school. But we're also excited about the broader implications here for greening the home: just because we think we've figured something out doesn't mean we've got the whole answer.

Rethink, reconsider: these are as much a part of green living as reduce and reuse.

image via Current Biology article, as linked above

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Circadian rhythms and physical adaptation to the daily cycle of light have been known for a while (1960s? 1970s?) -- what's cool about the more recent research is isolating a physical basis for how we process sensory input about the progress of the day.

So this is the "why and how" for some known phenomena such as how workers in cubicle farms with little or no natural light have higher rates of depression and general wackiness than workers who are near a window. (That's in Chris Alexander's A Pattern Language, and I'm too lazy to get up and see whom he cites.)

This is also the "why and how" behind why when you hop off your trans-Atlantic all-night flight at 6 a.m., you shouldn't go to bed but should run around in the rising sunshine, so that you'll get in sync with local time.

(After reading the lab procedure, "Three Blind Mice" won't stop running through my head...)

posted by wende in the twin cities on October 19th 2007 at 4:36pm
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