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Questions tagged [perception]

Perception is the process of attaining awareness or understanding of the environment by organizing and interpreting sensory information coming from body receptors and sensory organs into CNS.

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Why do simulations of dichromatic color vision portray medium wavelengths as yellow rather than green?

Please take the time to read & answer this at your own convenient pace. Is this even the right way to put this? Do you think this post better belongs in the Physics or Philosophy forums? This ...
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102 views

How exactly does sensory substitution work?

Sensory substitution, when one of sensory modality changes into another sensory modality to help someone restore the ability to perceive defective sensory using a working sensory modality. For example,...
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Can one see flickering of a light bulb at 50 Hz?

Yesterday I had a BBQ with some friends. The sun had already set and the only light source left (besides some ambient light from the world around) was a low energy light bulb. After a while I started ...
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How do we perceive weight?

How do we perceive weight of our own body or something we are holding? It might turn out that we don't perceive weight so is it subjective? Is it similar to pain, or something different?
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How do our eyes see an inverted image? [duplicate]

How exactly do our eyes see an inverted image of what we are looking at? Does it have something to do with the shape of our lens (i.e. convex)?
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Best colour for a dog to track an object against green background

As dogs have limited colour perception, what colour would appear with most contrast against a green background for a dog? I understand that red and green are very close in a dog's colour perception, ...
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56 views

Consistency of consciouness [closed]

So I was wondering if consciousness is continous and I found out it might not be the case. But in that case it begs a question, what if in every frame of consciousness my old me dies and new is reborn ...
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What are the differences (if any) in brain activity when hallucinating versus perceiving a real object?

I was wondering if there is difference in brain activity when someone is hallucinating an object, say a giraffe compared to when someone is genuinely observing a real giraffe?
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Why does my room suddenly look 'reddish'? My eyes seem to adapt to color

To get the context of this question clear, I would like you to walk through some parts of my house. We'll start with one of my rooms as it appears normally - As evident, this part of my house has a ...
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Is the masking effect of sound related to action potentials or to mechanical aspects of hearing?

I am an applied mathematics / signal processing engineer who wants to learn more and I have a question that has been bugging me for some time. It is known in audio coding circles that human hearing is ...
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25 views

Processing of speech/non-speech sounds in the human brain

I have a ""which came first: the chicken or the egg?"-kind of question regarding the processing and understanding of speech / non-speech sounds in the human brain. I'm wondering whether speech and ...
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107 views

Is synesthesia caused by crossing the circuitry of different sensory inputs?

I have a question about human perception. After reading the book "Sensory Perceptual Issues in Autism and Asperger Syndrome" and knowing about synesthesia (https://en.wikipedia.org/wiki/Synesthesia) ...
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Can crocodilians differentiate their offsprings from other young crocodiles?

I read that some species of crocodilians can take care of their young for as long as a year. How do parents differentiate their offsprings from other young crocodiles? Smell, appearance, sound?
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Is arachnophobia connected to lower immunity against spider toxins?

Are arachnophobics more subceptible to toxical effects coming from spider toxins?
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105 views

Is color perception evolutionarily arbitrary?

That is, were the various wavelengths of light that we and other animals can perceive assigned random color values by our evolving brains/eyes/visual structures at various points during that evolution?...
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Do human women smell different before they enter labour?

Surfing youtube I found a video where a cat shows a protective behaviour towards a pregnant woman soon to enter labour. In the miriad of average (dumb) comments I found another person stating that ...
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Is perception contrast based?

If I understand it correctly, humans can discriminate shades and colours based on their inherent contrast, as in we can see colors because there are different colors. Same for shades and for acoustic ...
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Can human perception differentiate between monochromatic and polychromatic light?

Maybe monochromatic is not the right word, what I mean is light consisting of a single wavelength (i.e. a spectral color) versus light composed of photons of multiple wavelengths (intermediate color). ...
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Why do I still see a bright light after looking directly at it?

When you look directly at a bright light, maybe accidentally when looking at the sun, the shape of the image may persistently be perceived even after you look away. Does this image persistence have ...
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What is the smallest touch sensation that a human can feel?

What is smallest touch (pressure) sensation that a normal, healthy person (not hypersensitive nor insensitive) can feel on the palm of the hand?
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What is the term for awareness of or inclusion of real sounds within a dream?

I fell asleep while listening to a podcast, and I am sure I was dreaming but I could also still hear the podcast. The podcast played an important role in the dream, I was searching for the source of ...
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29 views

Does size correlate with sensory abilities?

On average, do smaller animals have senses inferior to those of bigger animals? I ask because it seems like a somewhat logical assumption: smaller eyes would in theory collect less light, and smaller ...
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467 views

Is the human eye supposed to see the lense effect?

Just as the GoPro cameras, we need lenses to be able to focus. Nevertheless, we can see the "fisheye effect" on the shots taken by GoPros. I am talking about this: Is it possible to notice the "fish ...
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Sensing weather conditions through bodily reactions (e.g. dry hands, arthritic pains)

Two fairly known examples of the effect of certain weather conditions on the body are dry hands due to decreased air humidity around us (more commonly in the winter, as described here), and flaring of ...
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Is brain plasticity such that we can train ourself to see with our ears?

I am finishing writing some code which will parse a photo (eventually video) and use all the RGB information to synthesize an audio representation. I am wondering whether a typical person has ...
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What is the essential benefit of center-surround organization of retinal ganglion cells?

I am trying to understand the significance of the overlapping on-center off-surround and off-center on-surround organization of the retinal ganglion cells, also called center-surround organization. ...
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How we can localize sound vertically (up-down) and front-to-back?

It is quite simple to understand the concept of lateral localization of sound. It depends upon the loudness and time (and wave phase) difference between 2 ears. But how can we detect front-back ...
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Can low temperatures induce a withdrawal reflex?

I read in "Essentials of Pathophysiology: Concepts of Altered Health States By Carol Porth" that "The thermal pain receptors are stimulated only by extremes of temperature such as "freezing cold" ...
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Nature of sight/ color perception?

I am wondering how we perceive color and whether that is dependent on the wavelength of the light, or on something manufactured in the brain. For instance, if we evolved on a planet orbiting a red ...
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Why is there a difference in the orientation of my imagined body vs. my physical body? [closed]

My Personal Experience When I visualise a specific aspect of my body, the inner mental image does not seem to be aligned with my actual physical form in space. What I mean by this is: Say I ...
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Why do mints make your mouth feel cold?

Why do mints make your mouth feel cold? And specifically, why does your mouth feel so cold if you eat a few mints and then drink a glass of cold water afterwards?
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Definition of general anesthesia

To quote Goodman & Gilman : An alternative way of defining the anesthetic state is to consider it as a collection of “component” changes in behavior or perception. The components of the ...
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Why doesn't pure fat taste better than pure sugar? [closed]

I mean looking from evolutionary perspective sugar tastes sweet and individuals that had this perception ate more sugar and survived and those that didn't perceive sugar as sweet didn't eat it and ...
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Are 2 eyes necessary for 3D vision?

To start off: I'm not a biology student, but a computer science major It has always been my understanding that humans have 2 eyes so that we can have 3D vision: the left eye see more of the left side ...
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Perception of white in the absence of rods

If the retina would not have any cones, one would be color blind. If white is the presence of all colors (in the matter of color mixture, not addition), then what would white look like without rods?
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What effect does a bat's echolocation have on other bats?

Bat echolocation is a perceptual system where ultrasonic sounds are emitted specifically to produce echoes. By comparing the outgoing pulse with the returning echoes, the brain and auditory nervous ...
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Limits of brain neuronal spatial mapping

It is being claimed that brain maps the world space in (roughly) 1-to-1 correspondance of a place to a neuron (link1, link2). My question is: as the mapping happens in 1-to-1 manner, then is it ...
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Are some animals, like dogs and cats, color-blind and how do we know that?

I have heard that some animals, including dogs, cats and donkeys, are color-blind. They cannot recognize any color. Is that true? And how can humans verify that animals are color-blind, or not? During ...
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527 views

How do we perceive acceleration?

Today me and my friend were coming on motor bike and I was sitting opposite direction because I was holding something in my hand (and it was fun :P). When he started bike I felt very high acceleration....
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643 views

Does “squinting” make you concentrate better on a logic test?

We have all had those moments of intense concentration on some tough exam, perhaps a college test or whatever... Why is it that when we squint, it feels like we can focus and concentrate better on ...
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Skin extra sensitive to heat after burn

I just got my finger burnt (first degree burn $\Rightarrow$ I didn't even bother to bear the wound). It didn't hurt much, even when I pressed the wound. However, when exposed to heat (hot water, but ...
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Is perceived time compressed or expanded while dreaming? (or does it match reality) [closed]

I often dream long extended dreams. Sometimes I wonder if the timeline of the story of my dream occurs compressed, in a moment, or other times extended slowly over a long duration. Is there any way ...
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Why is wind cold for humans? [closed]

Coming out of the pool the other day, I felt very cold because I was wet and the wind picked up. My idea is that a "cold" feeling should be associated with low temperatures, but it's indeed wrong. ...
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272 views

Is there an absolute minimum intensity level to the stimuli we can perceive?

By stimuli that we can perceive, I mean what our five senses can perceive. Is there an absolute minimum for humans, or can we "train" ourselves to perceive stimuli at lower intensity? And if there ...
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What's the frequency resolution of the human ear?

I was thinking about audio compression (namely mp3), that "filters" out sound that we would not likely hear. The MP3 lossy audio data compression algorithm takes advantage of a perceptual ...
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How precisely can we sense temperature differences?

We have thermoreceptors, thus we can sense temperature (both warm and cold). I'm interested in the sensitivity of our thermoreceptors - What is the smallest temperature difference that we can sense? ...
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585 views

Reason for different color perception in left/right eyes?

What could be the reason for a difference in color perception between the two eyes of an adult individual without any known eye conditions? In particular, a difference in the perceived color ...
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237 views

White/Gold vs Blue/Black dress

So I'm sure you've all seen the dress photo where people see the dress as either White and Gold or Blue and Black. It has essentially 'split' the internet because some people see the dress and they ...
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How can bats achieve good resolution with wide beams?

I have been reading about the echolocation system in bats. papers state that bats tend to produce a sonar beam that has a beam angle (-3db) of about 30-40 degrees. This would be considered a wide beam ...
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Do humans perceive temperature or heat-flux? (or both?)

The general understanding is that when I touch an object, I perceive its (relative) temperature. A metal object at room temperature, however, will often feel cool to the touch. This leads me to ...