On 03/08/2011 06:36 AM, andy pugh wrote: > On 8 March 2011 10:56, Mark Wendt<mark.we...@nrl.navy.mil> wrote: > >> which is typically how we as humans think about >> light switches - "UP" is "ON", "DOWN" is "OFF". > > Actually, that's a US thing. (or at least a cultural thing). UK (and, > I think the rest of the EU) have down-for-on with domestic light > switches, and toggle switches in other situations.
Yeah, understand the cultural differences, but I was more pointing to the way the brain is wired. If you expect to see something one way, and you see it that way, even though the "switch" is wired opposite of what you normally expect, your mind will at that point decide that everything is what you expect it to be, regardless of whether other indicators are telling you different. It would be like having oil pressure indicator replaced, and the installer put it in say 90 degrees out of whack clockwise (assuming a round indicator display). On the original setup, normal oil pressure would have the needle pointing straight up indicating 40 pis, with the range from say 0 to 80 psi (high value pulled outta my arse...). Now, after the change, you're driving down the highway, or autobahn, or whatever, and you do an instrument scan. The oil pressure gauge has the needle pointing straight up. You don't notice that, while it's pointing straight up, the indicated pressure is 0. It's because it's what you're used to seeing, and the gauge needle is showing what you expect it to show, so your mind decides that your oil pressure is functioning where it's supposed to be. Then two miles (or 3.218 688 kilometers for you metric folks) later, your engine seizes. ;-) Mark ------------------------------------------------------------------------------ What You Don't Know About Data Connectivity CAN Hurt You This paper provides an overview of data connectivity, details its effect on application quality, and explores various alternative solutions. http://p.sf.net/sfu/progress-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
