Perception Definition and 138 Threads

Motion is probably not the right word, maybe perception. I was thinking one day about the speed of things and came upon a question I couldn't answer. So you have two people on either side of a valley, person #1 claps their hands. That sound reaches person #2 in X amount of time. Person #1 then...

Hi I have a problem related to an aspect of fantasy worldbuilding. I'll do my best to explain the issue but it has been rattling around in my head for about a decade so I'm sorry if some things are missed or misexplained as aspects of it are very obvious to me and therefore may be lacking in...

Say there was something that made the temperature of the universe almost absolute zero, but around you was a mini bubble where the temperature was normal, and therefore molecules could move normally around you for a small area. How would you perceive the world around you outside of the little...

I approach a traffic light. It is red. I know it is a light. What is happening in my brain to inform me that I am looking at a red light, and not a brightly colored red circle on the canvas of my perceptions of the physical world? If my eyes are moist and I squint, I see radiating red lines...

Here's a weird story I read about someone who lost their sense of time. In this case their ability to sense time was altered by a brain infection. The person's experiences are interesting. Time is important in tying things together mentally. Meanwhile, physical time marches on in their outside...

TL;DR Summary: Velocity and the human experience As I was walking into work this morning I looked up and noticed an airplane flying overhead. Airplanes travel at speeds of up to 550 miles per hour while in flight. This question is really less about physics and more about our everyday...

If an object is going close to the speed of light, will outside frames of references perceive the moving object as going slow or fast?

I am not cooking up a torture device or a weapon. In fact, I have been spending time with skeletal models. I just want to be able to create the ability to perceive pain. Even if I were to try to work this out myself and get some kind of answer that relates to physics, how would I know for sure...

For the illuminant A for the illuminant B Did I got them correct? Thank you

Many years ago I went to the cinema to watch Avatar in 3D, and was provided with polarising 3D glasses at the venue. I can't remember if it was my first 3D film that involved polarising projection technology, but it was certainly one of my first. In any case, the 3D effect worked and I got...

When it comes to the properties of a small particle (position, speed, etc) are those properties "certain" in reality and just "uncertain" to us (the observer). Or are they truly uncertain in reality? I never really hear experts be clear about that. In fact they leave the impression that there...

When you look at the following image through a prism with the apex (thinner portion) pointed towards the left or the right, why do you see magenta on one side and green and black on the other? Keep in mind that the spectrum is reversed.

Hello, Dear Readers, as mentioned in the caption and Summary, i'am dearly interested in the perception of time due to relativity. I thought About this for quite some time.What happens to the perception of time to the conciousness, I mean our weight is not the same, and our energy consumption...

I'm diving into the RQM and one thing still puzzles me. I have hard time understanding this: Taking the model system discussed above, if O′ has full information on the S+O system, it will know the Hamiltonians of both S and O, including the interaction Hamiltonian. Thus, the system will evolve...

If I make two rods with 1 meter length here on the surface of earth, and send one of them near a black hole that is at rest relative to earth, placing it there with its length alligned in the radial direction of the black hole, would I see the rod close to the black hole with a length shorter...

Hey guys! New to the forums so unsure if this is exactly the right place to present this idea I have. I hope that you will find it interesting. I am all too familiar with claims of quantum consciousness woo. I am also aware that the role of 'wave function collapse', if such a thing even...

There are been many threads at PF on the perception of color. I would like to share a good video on the subject, which contains many interesting visual effects. This is from the Technology Connections channel, which has many videos of interest to our community. I encourage you to browse around.

After I finished my EE degree (Major/Cumul GPA: 3.6, mostly A's in math and physics) in December 2015, I began work as a programmer at an electric company for a couple of years. I saved up a good amount of money and established myself to the point where I have the free time to even think about...

What is time perception? Is it the same as time dilation? Can one person perceive time going slower than someone else? Like, there was a study about Dreams and how counting 10 seconds in a dream is actually around 12 seconds in real waking life, what causes this? How is time perceived slower in...

In looking at this light cone diagram, I'm focusing on the part in purple. I'm interested to know if mathematics reveals the exact potential difference in time perceived by observers of three events as they shift between their different planes of simultaneity. This makes more sense using this...

The wavelength (wl) coming from a heating body (absolute black body) obeys Wien law. We can also find out this wavelength from the peak of the Planck's law. Planck's law describes a distribution of energy (per unit area, angle...) for different wls (or frequency,...). We say that body has some...

I think this question boils down to whether the parts of the inner ear grow from say age 6 to age 26. My thought is that if the parts of the inner inner ear do grow a little, then their response to what was a shorter wavelength of sound in the past will be the same as to what is a longer...

I have read things saying humans see 2d and also things saying its more like "two and a half d" but that humans don't actually see in three dimension. But when you explain the spatial dimension, you start with the first which can be explained by a line. So anything living in 1d would only be...

I'm posting this here because physics can't answer it. Neither is it philosophy. I was watching the first episode of Lucifer over again on my new UHD TV. My old UHD took a crap and it was low fps. Now watching my new TV I noticed motion looks different. I don't think it seems smoother like my...

Imagine yourself to be bat. You can't see anything. You don't have eyes. All you can do is echolocate, using ultrasound. Now imagine something is moving away from you faster than the speed of sound. Can you locate it ? Can you perceive its existence ? If the answer is yes, how ? If no , then...

Hi, my Name is Markus and I'm from Germany, I have more a lingustic & IT background with basics in physics from school times (some years ago, I have to say). I have a couple of more holistic questions, hope that is ok, please let me know, Have a great day!

The international Journal of Greenhouse Gas Control. It has an Impact Factor of around 4, but what's the perception? Is it respected? Is it considered a good journal? There isn't a qualitative judgment online. My boss seems to look down on it, but it has a good impact factor.

Can we please revive this thread with better references: My source for the Through The Wormhole Episodes is Wikipedia: Season 6 No. 2 : Can Time Go Backwards. There is a Youtube link: I was asking: "In Through the Wormhole Episode no.2 of the 6th series named Can Time Go Backwards (it starts...

I cannot conceive of time as an actual physical existence. What are the current opinions on what time is?

In Beethoven's Piano Concerto #5, third movement, the exposition contains an ascending phrase. When the exposition is reprised, the ascension goes up one extra time. And yet nothing after it seems to have been transposed to anything higher as a result. How is this possible? Where did the extra...

To think something with full concentration I close my eyes. I believe many people also do it. It seemed to work and generates good thoughtful results. May be because with eyes closed brain is free to handle the billions of photons coming from eyes. In a noise-free room concentration should be...

Why time perception changes continuously...? Could relativity be playing some role?

Does quantum gravity play role inside brain in ever changing perception of time?

Hello friends, I'm discussing here with a guy about how we see color and stuff... he claimed two suspicious things and I want to ask you If it is true and If there is evidence of what he said... claim 1 and 2... I'm talking evidence, not hypothesis...can anyone help me here? just remembering...

Two stones being dropped into a calm body of water at different times and sizes. The smaller one drops first, sending ripples out. Progressing in time. The second larger stone drops later, creating its own gravitational ripple which is larger than the first. Can the perception of time be altered...

It is a matter of fact that the perception of the yellow color occurs when the red and green sensitive-cones in human eyes are stimulated. I am interested to know whether this perception of the yellow color at the level of the brain happens instantaneously once the relevant parts of the brain...

Is it appropriate to talk about objects that can travel 'near' the speed of light? E.g. compared to a hypothetical observer moving at 'near' zero speed (very close to zero temperature/energy) wouldn't we seem to be moving 'close' to the speed of light. E.g. isn't even traveling 3 meters/second...

This is a bit of a logic problem that should be figure-outable from the information At the turn of the last century there was a debate about whether attention increased the perception of something by increasing the clarity of that one thing, or by decreasing the clarity of everything except...

can a line (thickness only in 1 dimension ) be observed in real life ? since ,at micro level , even atoms have thickness, is it even possible to really construct a line or point or plane in reality?

Boltzmann once stated that if the universe is ergodic then, in the event that the universe returns to a low entropy state, observers residing within the universe would always say that the lower entropy state was "the past" and the higher entropy state was "the future". My question is: I have...

If two people are in in space ships traveling next to each other at the same speed and they are going close to the speed of light they see each other expiriencing time more slowly. Why does this happen?

I was watching a Twilight zone episode yesterday . A spacecraft had crashed at a 'remote far corner of the Universe'...550 million miles from Earth (not even the distance to Saturn). Today I was reading a comment that complained about a local bottling company selling bottled water and using...

My understanding of the concepts involved in my question are very limited so please forgive me if this is an utterly stupid question.. I recently learned that depending on where you are in the universe, your perception of 'now' changes. I was pondering this whilst trying to get to sleep, next...

I've recently been encouraged by a response to questions I posed in another forum. I want to collaborate on the subjects of perception and time. Thanks.

If we look at a galaxy through a telescope, and IF the galaxy arms were ligned up as traight arms from center and out, the arms would look like they were spiral shaped. As the galaxy rotates the light from the closest stars would "hit" the telescope, let's say 100k-500k years, earlier than the...

Hello! This is my first post, so I should make a small introduction. I am not a science expert in anyway shape or form, but I am a keen enthusiast who regularly keeps up to date with science news through popular websites such as IFLS, Space, BBC etc. I have been wondering about this particular...

Sometimes when I'm lying on my back, trying to fall asleep, I create an image of something very small like a floating dust particle, marble, pinpoint, or a tiny steel ball. My brain automatically imagines an extreme weight or massive density of the tiny items. Then suddenly, a very odd feeling...

As far as i know, measurement devices present measurements based on something that affects the device's particles, for instance, forces, heat, tension, voltage... My question is, given that every change of position of any particle may affect the particles of the measurement device, why can't we...

Why do objects that are distant and moving appear to be moving slowly than the objects that are close?

Uneducated writer here looking for a discussion on the perception of other dimensions, including time: If the fabric of our universe is space/time, I understand that as humans, we can only really perceive space, that is I can see space all around me. However, I can only perceive this actual...