User talk:Hordaland/Archives/2010/March


Problem with PRC Drawing

Hello Hordaland, There is a small problem with the drawing you replicated of the Phase Response Curve located here: http://en.wikipedia.org/wiki/File:PRC-Light%2BMel.png You said that you took this information from this website: http://www.lrc.rpi.edu/programs/Futures/LF-Photobiology/. The title of your title of this reproduction is labeled "Human PRCs" however, the original image used in the LRC document is actually of the PRC of nocturnal animals (laboratory mice). (The online image is actually taken from a published document that I'd have to scrounge up if you need that information.)

The PRC for nocturnal animals and for humans is different. There have been studies done that show the PRC of humans, and I will try to scrounge up these resources for you if you need them. Currently there is some dispute about whether humans exhibit the same "dead zone" as is exhibited in nocturnal animals, and more studies need to be completed in order to determine this definitively. (You probably already knew this.) At any rate, your photo's label is misleading at best, and I was wondering if you could revise it? I thought I would ask here first before I posted on the photo's discussion page or contacted someone to take it down....

Feel free to contact with me any questions or comments. Sherazade96 (talk) 21:15, 2 March 2010 (UTC)

Possibly the most commonly referred to PRC for light for humans is here, and it is a popularized version of most of the human PRCs I've seen.
Many sources point out that the PRC to melatonin is roughly 12 hours out of phase with the PRC to light, for example [this abstract]. Figure 8 here shows PRCs to melatonin for rodent, lizard and human.
I'm aware that not all experts believe that there is a dead zone in the human PRC for light. If not totally "dead", the slight effect at that time is of little consequence. Figure 3 in this paper from 2003 shows a human PRC without a dead zone.
In short, I believe that the file PRC-Light+Mel.png shows a reasonable representation of the human PRCs to moderately bright light, very bright light and to melatonin. - Hordaland (talk) 03:13, 3 March 2010 (UTC)

The RfC on the Community de-Adminship proposal has begun

The RfC on the Community de-Adminship proposal was started on the 22nd Feb, and it runs for 28 days. Please note that the existing CDA proposal was (in the end) run as something of a working compromise, so CDA is still largely being floated as an idea.

Also note that, although the RfC is in 'poll format' (Support, Oppose, and Neutral, with Comments underneath), this RfC is still essentially a 'Request for Comment'. Currently, similar comments on CDA's value are being made under all three polls.

Whatever you vote, your vote is welcome!

Regards, Matt Lewis (talk) 11:18, 4 March 2010 (UTC)