"Mr Macaw" wrote in message news
On Tue, 26 Apr 2016 02:53:54 +0100, Rod Speed
wrote:
Mr Macaw wrote
Rod Speed wrote
Mr Macaw wrote
Rod Speed wrote
Mr Macaw wrote
Rod Speed wrote
Mr Macaw wrote
http://www.huffingtonpost.com/2013/1...n_4097761.html
"cats have a visual field that spans a whopping 200 degrees, as
compared to 180 degrees in humans"
I disagree with this. Firstly, I tested my own vision and I have
220 degrees.
Yeah, mine is much wider than most peoples' too.
You mean my 220 degrees is odd?
Just that its unusual for humans.
I seem to remember my classmates when I was at school were all quite
similar.
Either you stuffed that measurement up
Simple experiment.
Yes, but you must have either stuffed that up or have
fluked a very unusual group if everyone had the same
peripheral vision or you are remembering that wrong.
Not the same, all 180 degrees and over.
You previously said they were all quite similar.
A hula hoop around your head, with a coloured bead slid slowly round it,
while you stare straight ahead. You shout out the colour when you see
it.
or you're remembering it wrong.
I wouldn't forget that it was just over right angles.
That one is just a different measure, one eye or both eyes.
Most people don't have one eye closed.
No one said they did.
No wonder people don't see people coming when they drive.
You dont need 220 degrees to do that.
You dont even need 180 degrees.
If you don't have 180 degrees, you have to turn your head or move your
eyes all the time.
Most do that when coming up to an intersection.
I do too.
Yes, but peripheral vision means you see things you weren't looking for.
Yes, but most do look for oncoming cars.
And accidents are often caused because someone fails to look in one
particular direction (hence "he came out of nowhere"). Good peripheral
vision means you'd still see them.
And when accidents like that are quite common, particularly
when its a motorbike or a person riding a push bike, clearly
good peripheral vision isnt as common as you claim.
With 220 degrees, you see people to the side of your that you aren't
looking for, and you can effectively look both ways at once at a
junction.
I dont know anyone who doesnt move their head or their
eyes when coming up to an intersection, including me.
Because you get better vision with the central part.
Yes.
Peripheral vision will tell you something is moving, but probably not
how
fast and what direction.
And wont necessarily distinguish between say
a bike and a small tree or something like that
which will be moving in your field of vision
just because your car is moving as you drive up.
Then you must be able to tell direction of movement out of the corner of
your eyes, because I don't notice a tree moving because of my movement, my
brain ignores it. But a car moving alerts me to look that way.
Must be why so many motorbikes and
bike riders get runover in that situation.
The glassblowers at work would always know
when you talked up behind them, but that
was because of your reflection in their glasses.
I've had someone make rude gestures at me when I'm stood at a front door
waiting for an answer. A glass front door. Then they're surprised when I
notice them.
Never had that myself.
Secondly, I always find my cats looking straight at me or whatever
they want to examine, they don't seem to be able to see sideways,
That's a different question. I look directly at what
I want to focus on, but that doesnt mean that I
dont notice movement out of the corner of my eyes.
But I don't find myself staring continuously at the cat.
That may just be an evolutionary thing, works
better when catching rodents and insects etc.
It wasn't trying to eat me.
Sure, but that evolutionary behaviour may well apply to
anything it is concentrating on, not just what its about to
eat. You get the same thing with laser pointers or even
with something inedible on the end of a bit of string etc.
One of my cats does it forever. The rest will look away if I stare back
for more than 5 seconds.
That's because of your rabid blood shot eyes and the flecks of
foam about the lips and you howling at the top of your voice.
They are deciding whether to run or just hope for the best.
No, they're trying to work out if I'm angry at them for what they just
did.
That's because you keep kicking them.
Although I've taught them not to do most of their bad habits now, so they
are no longer so wary.
Once I've examined it, I don't need to keep watching it if it's not
doing anything.
These cats dont do that.
https://www.youtube.com/watch?v=KIeP...ature=youtu.be
They're either staring at each other or the camera.
They are looking at more than just those two things.
I only flipped through it quickly, but I only saw two things.
and the other day I walked over to one cat, I was 90 degrees from
his forward direction, and he didn't see me until I touched him to
stroke him, which scared the hell out of him.
Yeah, that's a much better test of that field of vision question.
Bur its likely that some cats have a form of tunnel
vision too. We know that young kids to, that's why
they can get run over when crossing the road.
I don't believe you.
Doesnt matter what you believe, that's been established
with rigorous science for a long time now. Trivial to test.
Utter bull****.
Fact.
"Newborn babies have peripheral vision" -
http://www.aao.org/eye-health/tips-p...on-development
Irrelevant to whether younger kids have a narrower field of view than
when they get older.
"Overall there was little evidence to support the hypothesis that
children
have poorer peripheral vision than adults relative to their foveal
vision." - http://www.ncbi.nlm.nih.gov/pubmed/3801789
Pity about the other studys that show they do have.
"Generally, if a baby
We aren't talking about babys.
is not tracking motion across their full range of vision by 3 months
of
age, parents should consult their pediatrician."
That has nothing to do with why kids get run over.
-
http://everydaylife.globalpost.com/p...ers-44127.html
Basically kids that don't use their peripheral vision are just plain
stupid. Their eyes work as well as ours.
Wrong with peripheral vision.
From personal experience of myself and school chums, it's the same in
kids
as adults.
That's nothing like a rigorous scientific measurement
of peripheral vision in kids and adults. That's been done.
Yet all these "scientific measurements" never seem to agree.
They do with simple stuff like that.
Like the global warming bull****.
Nothing like. That one can't even be done using experiments,
only observation is possible and its very hard to observe
accurately with global temperatures too.
And the links I read show it's more a lack on concentration than sight.
Easy to test that possibility.
Not really.
Yes, really. You do your test or the finger wiggling
version of it with and without other distractions.
"Why did you cross the road when a car was coming?" "I didn't notice it."
"Why? Didn't you see it or were you too busy chatting to your friend?"
"I don't know. I just didn't know the car was there."
That's not an experiment, that's just asking the kid after the event.
They have the same vision, they just don't pay attention and are
preoccupied with things they consider more important.
Wrong.
I've been a child, I remember being able to see sideways.
Doesnt mean that you always had the same
amount of peripheral vision when a young child.
Yip,
Nope.
it was measured.
It wasnt measured then and now and the results compared.
Was too. Just over 180 degrees, both times.
But not with all of the kids that it was initially measured with.
I remember us testing our eyesight in primary school for a
game/lesson, and it was similar then.
Then you didnt do it properly then.
Yes we did.
You clearly didnt if you concluded that all kids
have the same peripheral vision. They dont.
Similar. To within about 20 degrees per side. Everybody saw 180, some
more.
That nothing like what you previously said.
Yes it is. What do you believe I previously said?
Its still there in the quoting at the top. You previously
said all quite similar which nothing like as specific.
What are your experiences of cats vision
I dont remember actually testing that with any of the cats
I had and I dont currently have any cats that I can test.
Not easy to persuade a cat to look at something else while you're
doing something interesting.
These cats didnt need any persuading.
https://www.youtube.com/watch?v=KIeP...ature=youtu.be
I guess if one person distracted it maybe, but then you wouldn't
know
if it saw the second person to the side. You'd need something it
wanted to look at, then something even more exciting than that like
it's favourite treat.
With the neighbours' cats that love my jungle, they
normally dont look at me when I show up, they
mostly look where they are going while leaving.
Is that because you've just yelled at them?
Nope, I never yell at them in that situation.
The only cat I yell at is the ****er that insists on doing
a flying leap from the ground onto half way up my
****ing fly screen and then hanging onto the ****ing
fly screen with its claws in summer when its trying to
catch the moths.
Electrify the sunscreen.
Not possible, its plastic, not metal.
Change it then.
No point, much easier to shout at the cant to get it to stop doing that.
And nothing would happen even if it was metal.
You'd obviously have to have stripes of insulated sections, so the cat
touched two at once.
That wouldnt work either because cat's claws dont conduct.
Unless you like the moths.
It would have no effect on the moths.
Depends on how close the voltages were. Too close and it becomes an
insectocutor.
Too close and it wouldnt work for cats.
Mind you if you separated the high and low voltages enough, only a large
animal like a cat would get a shock.
I just shout at the cat and it ****s off.
After you've got a torn screen.
It has never torn the screen. Its a quite skinny light cat.