1080: "Visual Field"

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Quicksilver
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1080: "Visual Field"

Postby Quicksilver » Wed Jul 11, 2012 4:03 am UTC

Image
Alt text: "I recently learned something that solved a mystery that had bugged me since childhood--why, when I looked at an analog clock, the hand would sometimes seem to take a couple seconds to start ticking. Google "stopped clock illusion"."
Wow...same time post :( What's a supermoon?

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rhomboidal
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Re: 1080: "Visual Field"

Postby rhomboidal » Wed Jul 11, 2012 4:07 am UTC

Somehow, it's more reassuring to me to assume that all optical aberrations are just the Machines changing the Matrix.

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matt96
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Re: 1080: "Visual Field"

Postby matt96 » Wed Jul 11, 2012 4:09 am UTC

A real stopping of time is probably the best way to describe this awkward situation of two threads for the same comic apparently started at the same time, but I am posing here because it was apparently a few seconds faster, as it was lower on the reverse chronological listing of threads last posted in before replies to the duplicate threads happen.

deskjethp
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Re: 1080: "Visual Field"

Postby deskjethp » Wed Jul 11, 2012 4:14 am UTC

Something about visual clarity. Comic 1080(p). Anyone else notice this?
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Re: 1080: "Visual Field"

Postby karanj » Wed Jul 11, 2012 4:17 am UTC

deskjethp wrote:Something about visual clarity. Comic 1080(p). Anyone else notice this?


No, but thanks for pointing it out! :) Now I've just got to get the appropriate distance from the screen...

asdfzxc
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Re: 1080: "Visual Field"

Postby asdfzxc » Wed Jul 11, 2012 4:18 am UTC

deskjethp wrote:Something about visual clarity. Comic 1080(p). Anyone else notice this?

Son of a...
matt96 wrote:A real stopping of time is probably the best way to describe this awkward situation of two threads for the same comic apparently started at the same time, but I am posing here because it was apparently a few seconds faster, as it was lower on the reverse chronological listing of threads last posted in before replies to the duplicate threads happen.

They were submitted the same second, and microseconds doesn't work on phpbb unfortunately.

I might have beaten both of you by a minute or so, but when I first loaded the page Randal hadn't uploaded the large version yet.

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CorruptUser
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Re: 1080: "Visual Field"

Postby CorruptUser » Wed Jul 11, 2012 4:28 am UTC

Well, I'm a freak, I can see colors beyond the normal range (though they aren't as intense and I still have an easier time seeing in the dark from the sides rather than straight on). Also my eyes see slightly different colors than each other, so there's that too.

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Re: 1080: "Visual Field"

Postby ashes1032 » Wed Jul 11, 2012 4:38 am UTC

As someone who was born with basically no vision in their right eye, this comic was very interesting.

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Re: 1080: "Visual Field"

Postby ladyparts » Wed Jul 11, 2012 4:44 am UTC

I have two related burning questions.

1) can anyone explain how the 'see polarization' rectangle was made and how it works?

2) Why is that if I close one eye at a time, I can only see the blue/yellow with my right eye and not my left eye? I see the blue-ish 'target' with both eyes.

:shock:

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Re: 1080: "Visual Field"

Postby dzamie » Wed Jul 11, 2012 4:53 am UTC

Hmm... Wikipedia doesn't really have too much about chronostasis aside from its name and description. Oh well.

Code: Select all

:Clrhome
:while 1
:Output(randInt(1,8),randInt(1,16),randInt(0,9))
:Output(randInt(1,8),randInt(1,16)," ")
:Output(randInt(1,8),randInt(1,16)," ")
:End

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Re: 1080: "Visual Field"

Postby RockoTDF » Wed Jul 11, 2012 5:07 am UTC

After all these years, xkcd finally talks about psychology without making fun of it.

AND right when I start teaching Sensation and Perception, no less.

Woo!!

Thanks for the teaching tool! Seriously, this belongs in a textbook.
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Re: 1080: "Visual Field"

Postby tevriel » Wed Jul 11, 2012 5:17 am UTC

The debris in your eye that causes 'floaters' is the residue of a blood vessel that ran to your cornea while it was being formed in utero. When it became unnecessary, the blood vessel disintegrated, but the residue had nowhere to go.

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Re: 1080: "Visual Field"

Postby jqubed » Wed Jul 11, 2012 5:36 am UTC

dzamie wrote:Hmm... Wikipedia doesn't really have too much about chronostasis aside from its name and description. Oh well.


So, basically, it's our brain's image stabilization initially not realizing the clock hand is still supposed to be moving?

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Re: 1080: "Visual Field"

Postby Ardee » Wed Jul 11, 2012 5:36 am UTC

Since Randall will wonder why Friday's viewership will have declined 80% over today's:

It's because most readers will have snapped their necks flinging their heads side to side in an attempt to detect monitor polarization.

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San Fran Sam
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Re: 1080: "Visual Field"

Postby San Fran Sam » Wed Jul 11, 2012 5:54 am UTC

Hey cut this educational stuff out. If I had wanted to learn something, I would have paid more attention in high school.

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Re: 1080: "Visual Field"

Postby Sean Quixote » Wed Jul 11, 2012 6:00 am UTC

This comic really makes you see manually when viewed on a phone. :P

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"Visual field" - Resolution too low

Postby yoelf » Wed Jul 11, 2012 6:13 am UTC

Can it be reloaded at a higher resolution?
Dense text is all but illegible, zooming in just pixelate.
I find it ironic that in a post that deals with vision...

Much obliged.

reitsma
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Re: 1080: "Visual Field"

Postby reitsma » Wed Jul 11, 2012 7:00 am UTC

brilliant comic, but it still hasn't addressed a strange visual phenomenon that I experience - if you stare at an LED clock, and 'crunch' on something (causing jaw, and i guess one's whole head to move), the glowing numbers 'jump' around independently.
does anyone else have this experience?

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Re: 1080: "Visual Field"

Postby Justine Kerenskij » Wed Jul 11, 2012 7:22 am UTC

I just found again my physiological blind spot thanks to this comic.
The problem is, I cannot get rid of this kind of blindness anymore, and my mom got asked to type these thoughts.

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Re: 1080: "Visual Field"

Postby sotanaht » Wed Jul 11, 2012 7:35 am UTC

Im guessing those first two "low light" images closest to the center are supposed to be equally visible compared to the third one if not the center (center is 0 or zeroth in context). I'm guessing my contrast or brightness or whatever is set wrong for this comic since for me they are just (almost) solid black at any viewing angle, but the third and further out are at least slightly discernible in my peripheral vision.

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Max™
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Re: 1080: "Visual Field"

Postby Max™ » Wed Jul 11, 2012 8:21 am UTC

The woman came in while I was trying to detect polarization... she just kinda looked at me, saw it was xkcd, and walked away.
mu

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jnareb
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Re: 1080: "Visual Field"

Postby jnareb » Wed Jul 11, 2012 9:20 am UTC

A'propos: a very nice article about color vision and color wheels

"Color Wheels are wrong? How color vision actually works by @ASmartBear"
http://blog.asmartbear.com/color-wheels.html

found via HackerNews #104

WhiteAvenger
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Re: 1080: "Visual Field"

Postby WhiteAvenger » Wed Jul 11, 2012 9:28 am UTC

Unless I'm completely mistaken, the "Floaters" Randall points out (saying he doesn't know what they are) are in fact the blood vessels in front of our retina.

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Re: 1080: "Visual Field"

Postby Technical Ben » Wed Jul 11, 2012 9:39 am UTC

http://en.wikipedia.org/wiki/Chronostasis

Wow. I always noticed that, assuming it was down to some sort of error in perceptual judgement.
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Re: 1080: "Visual Field"

Postby Qaanol » Wed Jul 11, 2012 10:10 am UTC

Since it hasn’t been linked yet, the direct appearance of polarization is called Haidinger’s brush and has been known since 1844.

WhiteAvenger wrote:Unless I'm completely mistaken, the "Floaters" Randall points out (saying he doesn't know what they are) are in fact the blood vessels in front of our retina.

But then they would not float…unless you claim they are broken-off segments of blood vessel?
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udqbpn
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Re: 1080: "Visual Field"

Postby udqbpn » Wed Jul 11, 2012 11:06 am UTC

But where does it go?

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Re: 1080: "Visual Field"

Postby blowfishhootie » Wed Jul 11, 2012 11:17 am UTC

WhiteAvenger wrote:Unless I'm completely mistaken, the "Floaters" Randall points out (saying he doesn't know what they are) are in fact the blood vessels in front of our retina.


They are not blood vessels. In short, they are bits of the gel in our eyes called the vitreous humor.

Here is a link that explains it:

http://www.allaboutvision.com/condition ... floats.htm

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Re: 1080: "Visual Field"

Postby Nebby_99 » Wed Jul 11, 2012 11:19 am UTC

Can anyone explain to me what the bit at the top means? You're supposed to set your distance from the screen by some correlation of the image size (which can be anything depending on zoom/screen) and a piece of paper (which can be any size at all). What am I missing? :-\

eMPiko
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Re: 1080: "Visual Field"

Postby eMPiko » Wed Jul 11, 2012 11:20 am UTC

does anyone have a solid source on the color vision paragraph? i find it quite fascinating and i would like to learn more.

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Re: 1080: "Visual Field"

Postby orthogon » Wed Jul 11, 2012 11:23 am UTC

Max™ wrote:The woman came in while I was trying to detect polarization... she just kinda looked at me, saw it was xkcd, and walked away.


Can anyone see that effect? I have a suspicion that the polarisation thing is trolling. Randall just liked the idea of thousands of geeks wobbling their monitors (or heads) frantically while staring at a blank screen.
xtifr wrote:... and orthogon merely sounds undecided.

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Re: 1080: "Visual Field"

Postby blowfishhootie » Wed Jul 11, 2012 11:32 am UTC

Nebby_99 wrote:Can anyone explain to me what the bit at the top means? You're supposed to set your distance from the screen by some correlation of the image size (which can be anything depending on zoom/screen) and a piece of paper (which can be any size at all). What am I missing? :-\


I haven't done this, but the way I understand it, it says to cut a piece of paper to the same length as the thing at the top that looks like a rolled up piece of paper. I assume it accounts for your zoom - the roll of paper obviously will grow or shrink with any zooming, so it should be correct at any zoom level. Then you roll up your piece of paper once it is the appropriate length and put it against your monitor to measure the appropriate distance your head should be from the screen.

That's the way I understand it at least, I could be wrong.

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Re: 1080: "Visual Field"

Postby Ptolom » Wed Jul 11, 2012 11:33 am UTC

I read this comic on an old Trinitron CRT and now my eyes hurt.

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ModestMouse
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Re: 1080: "Visual Field"

Postby ModestMouse » Wed Jul 11, 2012 11:37 am UTC

WTH? The guy in the next cube is making farting noises while I wiggle my monitor back and forth trying to detect polarization. Yeah, we're the best of the best all right.

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Re: 1080: "Visual Field"

Postby SerMufasa » Wed Jul 11, 2012 11:41 am UTC

What happens if you duplicate the comic and then move the second comic over by dt?
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Re: 1080: "Visual Field"

Postby Enokh » Wed Jul 11, 2012 11:41 am UTC

Technical Ben wrote:http://en.wikipedia.org/wiki/Chronostasis

Wow. I always noticed that, assuming it was down to some sort of error in perceptual judgement.


Yet another way my brain terrifies me.

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Re: 1080: "Visual Field"

Postby radtea » Wed Jul 11, 2012 11:48 am UTC

RockoTDF wrote:Thanks for the teaching tool! Seriously, this belongs in a textbook.


The only issue is that it uses the word "see" to describe "the detailed physiology of what the eye does", which gets naive people confused into saying things like "you don't 'really see' colour in the periphery of your vision... your brain remembers what colour things are and fills it in for you", as if "the brain remembering what colour things are and filling it in for you" is by some ontological legerdemain not "really seeing". If it isn't seeing, what is it?
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Re: 1080: "Visual Field"

Postby Angua » Wed Jul 11, 2012 12:08 pm UTC

He missed out the fact that your nose means your visual field for each individual eye isn't a complete circle (as visual fields are tested with a device much bigger than your head).
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Re: 1080: "Visual Field"

Postby marsman57 » Wed Jul 11, 2012 12:14 pm UTC

I felt like I did it correctly, but I could see the blind spots without any problem. Did anyone else have this experience?

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Re: "Visual field" - Resolution too low

Postby Felstaff » Wed Jul 11, 2012 12:36 pm UTC

yoelf wrote:Can it be reloaded at a higher resolution?
Dense text is all but illegible, zooming in just pixelate.
I find it ironic that in a post that deals with vision...

Much obliged.


http://xkcd.com/1080/large/
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Re: 1080: "Visual Field"

Postby Bossi » Wed Jul 11, 2012 12:52 pm UTC

Also curious- if I fall asleep in the sun on a bright day, I'll often wake up to find that I can't see the color red for the next 5-10 minutes.


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