medically.... how many fps can a normal human eye/brain can perceive ?

[fpdlskf]

any opthalmologist ??

[WhitetailAni]

I'm probably wrong, but I don't think it works this way.

[Slottr]

It's just that the eye is so much more different than a display. You can't directly compare and get a result that means much 

[Moonzy]

I heard it depends on your mood and such

 

Someone proposed an interesting test:

If you've noticed, sometimes you'll see a spinning fan as if it's static, that's when the fan blades position change timing are in "sync" with your eyes, from there you can deduce the "fps"

 

I never bothered to do the test, but it's a fun concept

[AbydosOne]

3 minutes ago, Moonzy said:

If you've noticed, sometimes you'll see a spinning fan as if it's static, that's when the fan blades position change timing are in "sync" with your eyes, from there you can deduce the "fps"

AFAIK, this effect only works with a strobing light source (e.g. poorly designed LED bulbs, fluorescent lamps, etc). Normally, motion will just become so fast it blurs.

[WereCatf]

13 minutes ago, fpdlskf said:

medically.... how many fps can a normal human eye/brain can perceive ?

Human eye isn't a display, it doesn't see frames. There's a constant analog flow of information going from the eye to the brains, not all the cells are 100% in sync or even 100% identical and so on, so the question just doesn't quite make sense as-is. If you instead asked e.g. what's the fastest change a human eye can detect, that'd make more sense, but again, that's a very difficult one to answer, because it depends on how much light that passes to the eye, the colour of the change, what area of the eye it hits and so on -- there's a ton of nuance, basically.

[Moonzy]

Just now, AbydosOne said:

AFAIK, this effect only works with a strobing light source (e.g. poorly designed LED bulbs, fluorescent lamps, etc). Normally, motion will just become so fast it blurs.

Plausible explanation for the phenomena, never really verified

[Rohith_Kumar_Sp]

Corridor crew made a video on this 
 

 

[tikker]

Eyes don't really see in FPS in the sense we don't scan N times per second. A bit older, but still good points made with sources:

 

20 minutes ago, Moonzy said:

Plausible explanation for the phenomena, never really verified

 

21 minutes ago, AbydosOne said:

AFAIK, this effect only works with a strobing light source (e.g. poorly designed LED bulbs, fluorescent lamps, etc). Normally, motion will just become so fast it blurs.

Yeah you need a strobing light. Once you hit the correct frequency each flash of the light will catch the fan at the exact same location every time, hence looking stationary for you.

[Hairless Monkey Boy]

The answer is 24.

[su01]

Over 9000

 

The human eye can detect a single photon.

https://www.latimes.com/science/sciencenow/la-sci-sn-human-eye-photon-20160719-snap-story.html

 

But, the real limit is how many times neurons can turn on and off per second. Find that and you can calculate a better approximation. Each human optic nerve contains between 770,000 and 1.7 million nerve fibers. So multiply (on-off signals per second) by (1 million nerve fibers) that and you get the answer in FPS.

[Gix7Fifty]

I love it when this question always pops up.

[Middcore]

There is no easy answer to this question because the human eye does not see "frames." "Frames" are a way humans came up with of simulating motion through still images. The most advanced PC monitor or television we have is still operating on the same principle as a paper flipbook: we show a series of still pictures really fast and trick the eye into thinking it's seeing movement. 

 

A somewhat more meaningful question might be something like "what is the fastest image the human eye can perceive?" Like if you were staring at a screen, what is the shortest possible length of time an image could flash on the screen and still be noticed? Reportedly, studies on fighter pilots have shown that they could not only perceive but even identify the type of aircraft when a picture of an aircraft was flashed on a screen in a dark room for 1/220th of a second. Obviously the average person probably cannot achieve this - fighter pilots are likely to have exceptional vision to begin with an have spent years "training" their sense of sight. 

 

In another study, the US Air Force found that at least 120hz/fps would be necessary to build a ground-based simulator for assessing vision in an aerial combat situation: https://humansystems.arc.nasa.gov/publications/2012_08_aiaa_ig_obva.pdf Note that doesn't mean 120fps is what they concluded the upper limit of human perception is. Rather, they found experienced pilots could easily perceive beyond 60 or 90hz and felt that a steady 120hz was the minimum their system would need to hit to be useful for training. 

 

Note that there is a difference between the human eye's ability to perceive a high speed object/image first-hand in real life and its ability to do so through a display like an LCD screen.