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Questions tagged [sensation]

Sensation is dealing with the processing of the senses, including the traditional senses vision, hearing, taste, smell and touch, but also sense experiences such as vestibular and pain. It typically involves the higher-level cortical brain areas associated with the conscious experience of physical stimuli.

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36 views

Can thought processes be sensed to happen exactly in the head? [migrated]

It's common knowledge that humans think with their brains. So it's common to associate hard thinking with head and to seemingly "feel" that it's the head which is loaded when one's thinking. But does ...
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1answer
49 views

Why/how does exposure to noise cause cochlear hair-cell loss?

I am trying to understand why listening to loud music - e.g. concerts or earphones at high volume damages hearing. According to the National Institute on Deafness the cause is physical. Most ...
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Petting sensation of mammals

Do other mammals get a similar enjoyment from petting as we get from scratching an annoying itch? Maybe a stronger version of it? Since dogs do emulate scratching themselves with their hind legs when ...
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2answers
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Understanding the “Waterfall Illusion”

Motion after-effect illusions, such as the waterfall illusion, refer to illusions where fixating a screen which shows stimuli moving in a particular direction elicits the perception of motion in the ...
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2answers
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Are there gaps in what our ears can hear?

I know about the hair cells in our Cochlea and it is the movement of the fluid that makes them vibrate. And it is this that activates the transmission of electrical signals to the brain that become ...
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1answer
29 views

A speculative question about sensation

I know this is rather speculative and I am not a biologist, but I have womdered about this for a long time. I have always been able to pinpoint the central line of any part of my body exactly as if ...
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1answer
120 views

Multiple numbers in the Ishihara test?

When I was in high school (30 years ago), I took a biology class, and the instructor showed us an Ishihara color test for color-blindness. (This is the "hidden numbers" test.) What I thought I saw ...
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1answer
48 views

How do we feel sensations from a tooth surface that is made up of enamel?

If enamel does not have any sensory receptors, how do we feel the tactile sensations when we touch our teeth with an object/finger nail?
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39 views

How many “primary colors” can we smell? [duplicate]

There are many more that three visible wavelength in the visible EM spectrum, and yet we can model any color using only three primary RGB wavelength. Perception of an arbitrary color is equivalent of ...
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75 views

How can we usually “trust a fart” not to be liquid or solid?

Jack Nicholson's character Edward Cole in the movie The Bucket List said ...and never trust a fart, and a search for Al Roker leakage White House will clear up any doubts what that's all about. How ...
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1answer
122 views

Why is peripheral vision not bleached by daylight?

In daylight, rods are known to be bleached: we have to wait some time after going into darkness before scotopic vision becomes effective. But, as I understand, peripheral vision is also mostly due to ...
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1answer
69 views

How are sound waves amplified while traveling within the cochlea?

How are sound waves amplified while traveling from the basal membrane to apical membrane within the cochlea? Are they amplified by the movement of the stapes?
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6k views

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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147 views

What is the signal conversion from hair cells to cochlear nerve cells?

If I understood correctly, inner hair cells generates a graded potential (receptor potential), this potential maps the stereocilia deflection. On the other hand, the cochlear nerve cells transmit ...
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2answers
38 views

why do we tighten out muscles against cold?

When I'm in shower and I want to open the cold water on myself suddenly I make my muscles so tight before I open the water and that helps so much in being able to handle the shock. Why does tightening ...
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1answer
101 views

What is an “Alternative Sensation”?

As far as I know, alternative sensation it's a sensation to distract people from the original stimuli, for example when you have to get an injection, the nurse will pinch you in the other arms so your ...
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1answer
2k views

What is the direction of the processing of light by the (human) retina and how does it happen?

Quoting Textbook of Medical Physiology by Guyton and Hall, 2016, page 647, ...the functional components of the retina, which are arranged in layers from the outside to the inside as follows: (...
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1answer
74 views

Pitch perception - why is the missing fundamental not directly detected in the cochlea?

I'm learning about pitch perception, and learned about the case of the missing fundamental. In the main image in that wikipedia page, it seems like the bottom graph, with the fundamental frequency ...
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11k views

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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1answer
130 views

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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1answer
42 views

Are there organisms sensing conformations, which we humans can't sense directly? [closed]

Are there organisms which can sense the conformations, which we humans can't sense directly, i.e. without using any equipment? If there are organisms which can sense conformations ("the shape or ...
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2answers
109 views

Are resonances the reason receptors work?

From Visual phototransduction - Wikipedia: When struck by a photon, 11-cis retinal undergoes photoisomerization to all-trans retinal which changes the conformation of the opsin GPCR leading to ...
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1answer
207 views

What causes Pseudomonas fragi to smell sweet?

I am working with Pseudomonas fragi and I could not help but notice that it smells sweet, which probably explains its species name 'fragi' from 'fragum', strawberry in Latin. Does anybody know what ...
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1answer
127 views

Is it the theory of the 5 senses obsolete? [closed]

An enigmatic topic in traditional science was labelled as the mystery of the 5 senses, and how to best group senses by type. Is that theory now meaningless? Do Scientists still agree that that ...
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3answers
115 views

How do our sensory organs work automatically without our conscious effort? [closed]

I wonder how our different sensory organs (e.g., eyes, nose, ears, etc.) work automatically without our conscious efforts or without our command. We don't have to tell our eyes how to see, our ears ...
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Sensitivity Along Digestive Tract [closed]

Suppose you swallowed a little capsule with a blunt poker which had some impulse of force applied every few seconds. What would be the sensitivity ordering (of lips, mouth, throat, esophagus, stomach,...
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119 views

Cold water sour taste

Recently I underwent a wisdom tooth extraction, and while there is still numbness I have observed something peculiar. If I drink cold water, it tastes sour, however the same effect is not observed ...
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1answer
2k views

How greater magnitude implies greater frequency of action potential?

Greater the magnitude of receptor potential, greater is the rate of discharge of action potentials in the nerve fibre.1 Now consider a case where stimulus ( strength ) is large , so there is more ...
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Does Rüppell's Griffon Vulture Have Greatest Vision Acuity? (Small Carrion Spotted at 10 km+?)

Synopsis: Some sources seem to imply the Rüppell's (griffon) vulture (Gyps rueppelli) can see objects at a distance in excess of 10 km -- roughly three times the ...
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Why do humans not have a powerful sense of smell?

It seems like a useful ability to be able to detect many different things about, say, another organism. A lot of mammals have this ability. Why not humans? Did we evolve it out or never develop it?
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What digitally encoded smell formats exist?

Is there a defacto format for storing and transmitting smell digitally? Where can I obtain samples of such smell encodings? What reference dataset exists against which I can compare my smell sample to ...
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1answer
76 views

What is mold detection threshold in humans?

I managed to find primary taste detection thresholds, e.g. for sweetness it's 1 part in 200 of sucrose in solution. Recently I've noticed that I can detect mold smell/taste even if there are no signs ...
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1answer
927 views

Can frogs see clearly under and above water?

If humans attempt to see underwater, the image is blurred due to refractive differences in air and water that disrupt the normal refractive effect of the lens in the eye. A diving mask overcomes this ...
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2answers
7k views

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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1answer
2k views

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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860 views

What would happen if you “rewired” your eyes with your nose?

The nose sends sensory input through transduction of chemicals in the air via the olfactory nerves/tracts to the primary olfactory cortex. The eyes send sensory input through transduction of light ...
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3answers
14k views

Is there an RGB equivalent for smells?

Millions of colors in the visible spectrum can be generated by mixing red, green and blue - the RGB color system. Is there a basic set of smells that, when mixed, can yield all, or nearly all ...
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58 views

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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452 views

Why can't I smell things that aren't there?

I can close my eyes and imagine a red cube with a yellow star on it. Although I don't literally see it -- if there was a red cube with a yellow star on the inside of my eyelids, I'd know the ...
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2answers
142 views

How can bobcats feel the mice under the snow?

I've just seen the Planet Earth II's second episode "Mountains" where they shock us with these North American bobcats that can feel mice from the distance of several meters, sneak to them and kill ...
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1answer
315 views

Most accurate depiction of cortical homunculus?

I was looking at cortical homunculus and I realized there are several different pictures and they don't quite agree. For instance: http://wellbeing.media.mit.edu/2014/02/21/mindfulness-neuroimaging-...
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321 views

Is bad tasting food more likely to cause harm?

Taste is often referred to as subjective. For example certain foods taste bad to me, such as oranges, grapefruit, grapes, raisins, and sweet potatoes. However the wiki article on taste explains that ...
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1answer
357 views

What makes a 'sense'? Is fatigue (tiredness) a sense?

I have watched to new episode of Scishow on that scientists added 3 new senses (Thermoception, Proprioception and Equilibrioception) to our 5 sense list, and was wondering what makes a 'sense'? Wiki ...
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124 views

Smallest pressure differential that humans can detect

While cooking dinner under an extractor on its lowest setting, I noticed that none of the steam (referenced by the amount of fogging on a nearby window, compared to the absence of the fan, was ...
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1answer
169 views

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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1answer
44 views

Are fish averse to extreme heat?

Terrestrial animals face two common sources of heat extreme enough to pose a danger to them: Sunlight and fire. It therefore stands to reason that they would evolve systems for sensing heat and ...
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1answer
139 views

How do afferent mechanoreceptors work on the finger pads?

I'm having some difficulty understanding how the afferent signals are sensed in the finger pads. My understanding is that for mechanoreceptors, as the indenting force increases, their effective ...
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2answers
2k views

What causes the tonotopic organization of the inner ear?

I'm trying to understand why tones are registered in the way that they are in the inner ear, i.e., why are high pitched sounds sensed at the base of the cochlea and low frequencies in the apex? I've ...
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1answer
1k views

Can a color-blind person see color with filter glasses?

Why does color vision improve in color-blind persons using these filter glasses from Enchroma? Will a color blind person be able to see the same colors on a television? I'm asking, because the colors ...
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2k views

Can we taste electrons?

Why does licking a 9-Volt battery elicits a taste sensation? Can taste be stimulated by electrical stimulation?