Hello all. Did not know on which subforum to post. Here it goes.

If a LED is flashed for a tenth of a second, it is easily discernible. - For the same current/power pulse; if the time of a single flash is reduced to a hundredth of a second, it also is. What about 1 millisecond ? And 10 microseconds ? Shorter ? What determines the shortest time for perception ? Should it vary by observer ? Would color sensitivity be a factor ?

It’s a matter of how many photons it emits. With a dark-adapted eye, you can discern 5-7 photons hitting the retina, but because there are losses in getting there, around 50 or so photons need to hit the eye.

How many have to be emitted is an issue of the geometry of the situation.

https://research.physics.illinois.edu/QI/Photonics/pdf/PWDec16Holmes.pdf

A 1 mW source pulsing for 1 microsecond is emitting something like 10 billion photons

Color sensitivity is a factor; you are much more sensitive to green than red or blue,

9 hours ago, Externet said:

Hello all. Did not know on which subforum to post. Here it goes.

If a LED is flashed for a tenth of a second, it is easily discernible. - For the same current/power pulse; if the time of a single flash is reduced to a hundredth of a second, it also is. What about 1 millisecond ? And 10 microseconds ? Shorter ? What determines the shortest time for perception ? Should it vary by observer ? Would color sensitivity be a factor ?

No offence meant but

Go see an optician.

😁

I say this because when you go to the opticians for eye tests, some of the tests are based on flashsng lights ever shorter and faster until you can no longer catch them.

As I am not an optician I don't know the timings, so ask one.

13 hours ago, Externet said:

Should it vary by observer ?

Yes, all eyes are different, just as everyone will not hear things the same way or walk the same way.

Different number of receptors, size and shape of the lens, thickness of the nerves etc.

The stimulus from the retina to the brain is not instantaneous either, fast though, about 40-100 m/s.

A short distance so not too far off instant.

I didn't know about minimum photons but the guys covered that.

Edited October 13Oct 13 by pinball1970

The human visual system can detect a new image in about 10–20 milliseconds, and consciously recognize it in roughly 100 milliseconds.

On 10/13/2025 at 1:52 PM, pinball1970 said:

The stimulus from the retina to the brain is not instantaneous either, fast though, about 40-100 m/s.

22 hours ago, Jackleo said:

The human visual system can detect a new image in about 10–20 milliseconds, and consciously recognize it in roughly 100 milliseconds.

I was reading a website the other day (wish I'd bookmarked it, can't find it or remember the name now) that spoke about human interaction in Zero Point Field.

Iirc, it mentioned at one point that we observe patterns, the patterns become wavelengths & are then returned to patterns via our brain which allows us to process/understand them.

Coupled with the above 2 quotes I'm curious.

Could this delay between seeing & understanding then represent a very brief wavelength information communication between 2 humans.

Is it an indicator of a knowledge/information communication via the wavelength in the pattern - wavelength - pattern process.

Could it be thought of as visualised pattern (boundary condition) - wavelength (information transfer) - pattern recognition/understanding by our brain (boundary condition)

Is the delay between seeing & understanding, observational evidence? of the time this wavelength exists.

All be it extremely brief. 0-10m/s or 0-40m/s, whatever this brief time frame is before our brains understand it.

Edited November 20Nov 20 by Imagine Everything

43 minutes ago, Imagine Everything said:

Coupled with the above 2 quotes I'm curious.

Could this delay between seeing & understanding then represent a very brief wavelength information communication between 2 humans.

Is it an indicator of a knowledge/information communication via the wavelength in the pattern - wavelength - pattern process.

Could it be thought of as visualised pattern (boundary condition) - wavelength (information transfer) - pattern recognition/understanding by our brain (boundary condition)

Is the delay between seeing & understanding, observational evidence? of the time this wavelength exists.

All be it extremely brief. 0-10m/s or 0-40m/s, whatever this brief time frame is before our brains understand it.

The brain takes observational evidence from the past and superimpose it on the potential present, in order to 'lift a finger'...