[HN Gopher] Thermal Grill Illusion
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Thermal Grill Illusion
Author : ZeljkoS
Score : 58 points
Date : 2021-09-25 19:31 UTC (3 hours ago)
(HTM) web link (en.wikipedia.org)
(TXT) w3m dump (en.wikipedia.org)
| stevep98 wrote:
| There used to be a demo in Epcot ('The Body'?) which had two
| coils, one cold and one heated.. they were separate at the ends,
| so you could feel the difference. In the middle, they were
| interleaved, and if you put your hand on it, it would feel
| simultaneously hot and cold. Cool demo.
| schoen wrote:
| They have this at the Exploratorium, too!
| goldenkey wrote:
| Someone ought to make a thermoelectric/peltier toy version of
| this illusion. Would be good for a Curiosity Box or something of
| the sort.
|
| I've used the Coolworks IceProbe, a peltier cooler with a
| heatsink and fan, for cooling drinks at my desk and for the
| custom cat fountain I made for my kitties [2] [3]
|
| Email me (address in profile) if you'd like the plans for my
| silver-infused (antibiotic) NSF-grade 0.5 micron filtered cat
| fountain. I spent over three years perfecting it.
|
| [1] https://en.wikipedia.org/wiki/Thermoelectric_cooling
|
| [2] https://pentairaes.com/coolworks-ice-probe-reg.html
|
| [3]
| https://photos.google.com/share/AF1QipO871ejy0WcW85ACBSq8Ue8...
| gregschlom wrote:
| https://www.youtube.com/watch?v=otweN9sCSd8
| canjobear wrote:
| This article needs a rewrite. I can't understand what's going on
| here:
|
| > But if the person presses against only a cool bar, only
| coolness is experienced; if the person presses against only a
| warm bar, only warmth is experienced.
|
| > Researchers have used the illusion to demonstrate that burning
| pain sensation is in fact a mixture of both cold and heat pain
| and that it is only the inhibition of the cold pain "channel"
| that reveals the heat component.
|
| How does the point about inhibition follow from the experiment?
| Is the cold pain channel somehow inhibited by the grill, but
| still active when only touching the hot part? idgi
| GordonS wrote:
| > burning pain sensation is in fact a mixture of both cold and
| heat pain
|
| Hmm, interesting. I know I'm off at a tangent here, but as an
| aside, I have small fibre neuropathy and struggle to describe
| the pain - sometimes I think it's more like a burning
| sensation, other times I think it's more like a painfully cold
| sensation.
| kulor wrote:
| Pretty good visual explanation of the "grill" and its effects:
| https://www.youtube.com/watch?v=otweN9sCSd8
| gzalo wrote:
| I think I have experienced this when accidentally placing a
| MacBook (after a few minutes of heavy CPU usage) in my belly
| skin, below the belly button. The body of the notebook is a bit
| hot, while the screen itself is cold (or it feels colder due to
| the aluminum). If both parts touch the screen you feel like you
| are burning, but if you only touch one of te two parts it's ok.
| FeepingCreature wrote:
| Tried out the finger version with three glasses of water. I could
| only reproduce it partway - my middle finger felt like it was in
| hot water, when it was actually in cold.
| canjobear wrote:
| I felt the correct temperatures in all fingers.
|
| I'm starting to think this whole concept is bogus or at least
| very variable across people.
| zapt02 wrote:
| I've tried this in a classroom settings (with the pipes) - it
| definitely works.
| tmm wrote:
| Glad I'm not the only one! Since I was in the kitchen when I
| read this, I had to try. Same result, all three fingers felt
| like they were in warm water.
| rootusrootus wrote:
| Similar experience. And it wasn't foolproof, I could feel the
| conflicting sensations, and detect that it was not quite right.
| teeray wrote:
| All three of mine felt like they were in a hot cup of coffee.
| The faster you put your fingers in, the more intense the
| sensation in my experiments
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(page generated 2021-09-25 23:01 UTC)