Questions tagged [brain]

The primary component of the central nervous system, which, along with the spinal cord, controls the body of bilaterally symmetrical beings.

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122 views

What is the science behind talent? [closed]

So some people are better at doing stuff than others of the same age..in other words, they have talent. So I am asking, what is the science behind talent? What is different in their brains than ...
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357 views

Why is the internal capsule dark in this transverse section of the brain?

Why is the internal capsule dark in this transverse/horizontal section of the brain? If it is white matter, then why isn't it white? P. S. : Formalin was used for fixation. Why the same color was ...
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What is the brain's preferred energy source? Glucose or ketones?

As with all cells in our body, I know that the brain can get fed from both glucose and ketones, so my question is, given both of them, which one would the brain prefer to utilize first?
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Book recommendation to know and understand the brain and the phenomena and processes related to it [closed]

I need a book recommendation or, more properly, any source recommendation to know and understand more about the phenomena related to the brain, as far as we know how the brain works. I'm interested in ...
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The simplest organism that can learn?

What is the simplest organism that was observed to learn: change its behavior permanently in response to some event/stimuli in a way that this change persists even if the event does not happen again?
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What are Intersensory Associations?

While I was reading about "Neural Control and Coordination" I came across this "Association areas in the forebrain are responsible for complex functions like intersensory associations, ....." What ...
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In what situations, when reacting to impressions, are the signals sent directly from the thalamus to the hypothalamus?

Normally when humans react to impressions, signals are being sent through different centers in the brain through the chain of: Impression ${\rightarrow}$ Thalamus ${\rightarrow}$ Cerebral Cortex ${\...
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294 views

How do humans know what goes on in optical illusions? [closed]

Optical illusions are designed to deceive humans, I think. That thing is moving! It really is! It's moving! However, user Konrad Rudolph just told me what went on in a different optical illusions ...
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Being able to write/type different texts using each hand respectively, at the same time?

Has there been any documentation of being able to either write down (jot down) or type in (key in) different texts using the left hand and the right hand respectively, simultaneously? So, I'm ...
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How can a powernap boost memeroy and cheerfulness?

Background A power nap is a short sleep which terminates before the occurrence of deep sleep or slow-wave sleep (SWS), intended to quickly revitalize the subject. (wiki) The results of ...
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Why use embryonic neurons to study protein knockouts/mutants in long term potentiation?

Just wondering if anyone had some ideas about the question in the title. I'm just wondering why some papers use embryonic cultures of specific brain regions for neurones to test the effects of ...
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Is the information in the brain stored in the connections rather than neurons?

Can I imagine the difference between the model of the grandma neuron and the model of interconnected neuron network so that the information isn't primarily stored in the neurons (respectively in their ...
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521 views

Has the concept of allostasis been adopted in biology, in place of homeostasis?

Peter Sterling, among others, has been a prominent critic of the concept of homeostasis. He instead proposes a process called allostasis. Homeostasis involves having fixed set points for ...
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Are these principles worth being validated? [closed]

Odunayo's principle of inhalation states that provided a given amount of water is ingested, inhalation through the nostrils will be excluded due to the presence of oxygen in the water. From the above ...
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Are we naturally born right or left handed or ambidextrous?

Most of you here will be right or left handed. A few might be ambidextrous. But were we born that way? I'm wondering if everyone was born ambidextrous, but as they grew up became more dependent on ...
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How is the beginning of an episodic memory encoded in the brain?

before asking how information is stored, I need to understand how does episode start and end are determined by the brain ? how do i remember a movie ? can you suggest a link to article addressing ...
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Why do cells in the cerebral cortex act as interacting nonlinear oscillators?

I'm not a biologist, but I'd like to know something about EEG analysis. In particular, I have read that EEG signal derive from cells in the cerebral cortex and hippocampus. And that these cells act ...
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Hand motor control of the brain [closed]

I was watching a documentary (don't remember the name or the URL to the documentary) but they stated that the brain is layered and that each new layer is placed on top of the last. So the most ...
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The human brain in numbers I: neurons

Even though knowing the number of neurons in a functional unit or with the same function is not of main importance, it may be interesting to know their orders of magnitude, especially in the human ...
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Is hunting animals, crafting and attacking/defending from enemies intellectually equivalent to learning quantum physics? [closed]

Our brains were shaped after natural selection. Which means that, as long as we were being affected by it, our brains were changing, evolving. Once we stepped out of nature and stopped being targets ...
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1answer
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What happens to the hollow nerve cord? [closed]

The dorsal nerve cord of vertebrates is a hollow structure that develops into the nervous system. This embryonic tissue is hollow and I wonder what happens to this 'hollow' later? Does it form the ...
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1answer
73 views

Is there a complete connectome of a cortical minicolumn? [closed]

I know that there are projects that try to map brain connectivity. Given that a cortical microcolumn has only around a hundred neurons I wonder whether there is a dataset available with the complete ...
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1answer
308 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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How many neurons are stimulated by electrodes in memory engram experiments?

Researchers have recently identified "engrams" in the mouse hippocampus, "sparse populations of neurons" or "small clusters of cells", stimulation of which elicits a specifically trained fear memory ...
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Is it possible to perfuse chemicals into brain after removal from body?

I've read studies where fixatives (eg glutaraldehyde) have been perfused into the brain while it is still inside the skull. I would have thought that this could also be done after the brain is removed,...
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4answers
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Human brain is superior than till-date computers, yet why we perform poor than computer?

Scientists found storage capacity of synapses by measuring their size. They found, on average, a synapse can hold about 4.7 bits of information. This means that the entire human brain has a capacity ...
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Do action potentials cause the neuron to heat up as well as its environment?

I have read that we might be yawning to cool our brains down, so then a thought occurred to me. If we need to cool down our brain, then our brain but heat up for some reason. The only reason I could ...
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Can human eys/the brain be trained to see with bidirectional monocular vision?

Most people have a dominant eye, and while it uses its non-dominant eye in tandem with the dominant eye most of the time, the brain, being an expert in eliminating redunant information, ignores the ...
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Is 8 hours of sleep necessary?

Many studies claim that humans need 8 hours of sleep. During sleep there are several different stages, from stage 1 to 4 as well as REM sleep. However, are all these stages actually necessary? If yes, ...
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1answer
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Correlation between threat and odour, taste

Is there any sort of correlation between threat and taste/smell? Are we evolved such that things which are harmful to life taste and /or smell bad and things(food) which are useful to us taste, smell ...
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1answer
214 views

What happens when the congenitally blind brain receives visual input?

If a congenital blind person gets eye sight (either hypothetically, or in the near future due to advancements in technology), will their brain be able to handle that information, or will it become ...
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Memory capacity of the human brain in bytes? [closed]

Is there an estimate out there for how much memory (in bytes) an average human brain can have? Is there a physical limit?
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1answer
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Confusion about the brain regions - temporal cortex, hippocampus and and white matter

I am a computer scientist working with brain data. I have some data from different brain regions, and the regions are called temporal cortex, parietal cortex, hippocampus and forebrain white matter. I ...
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Evolving a smaller brain

In Kurt Vonnegut's novel Galapagos, a certain mammal species, due to drastic and peculiar environmental changes, evolves (among other features) a smaller and smaller brain. Has this ever happened? ...
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Which of the response is faster? voice or hand action?

After taking certain stimuli and making the the decision to do certain action, which one response (output) (out of 2 possible output-ways, voice and hand-movement) would act faster? For example lets ...
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Does some form of self organizing map exist in the brain?

Self organizing maps (SOM's) are an extremely interesting and powerful tool in the field of artificial neural networks. My question is: Does something similar exist in the brain? Or are these systems ...
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How did we get self-aware?

Imagine being under a lot of stone age people and you are the only one who thinks something like "Hey I am a human being, and now I am thinking about this and that and maybe I change myself to become ...
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Lampreys and the origin of certain brain structures

I'm not sure why, but I'd been under the impression that things like the optic tectum and basal ganglia developed post-2R (the double duplication of the genome ~1/2 Ga). Lampreys (as far as I'm aware)...
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Can human be emotionless?

Is it possible that a person can't produce, like, dopamine, serotonin, and other emotion hormones? Or, a part of the brain can't function to make one feel something?
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How do neurons find each other?

Neurons form complicated networks in brains, but their connections can't be random (at least not entirely). Brains function similarly among all members of individual species, and that functionality is ...
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Does my brain have limited learning capacity or memory?

Lately in my free time I like to read books, articles etc etc.. What I have discovered, or maybe it is an illusion(lack of concentration or something), is that I usually forget most of the material ...
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Why does crippling pain exist? [closed]

Some kinds of trauma can cause pain so severe that it makes you unable to move or do anything at all. It may put you out of action and unable to help yourself because of how excruciating it is. ...
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What's the mechanism for being mentally tired?

I notice that after long tests, or long periods of critical thinking, my body and mind feel noticeably tired. Why does this happen? Are the neurons in my head not firing as quickly, or is there just a ...
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What really is color and how do we perceive it?

How do our brains actually transform the information that the cones in our eyes receive into the different colors that we can see and imagine?
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Is it comfirmed that Alzheimer's is a diabetes of the brain?

I read in this New Scientist report, that the mental decline during diabetes may be an early stage of Alzheimer's. The hypothesis was based on a study with 20 rats. Has there been any follow up ...
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Physical activity in fasted state: Glucose for brain vs muscles [closed]

Let's consider this scenario: You do sports in the morning in a fasted state (i.e. without consuming any calories after waking). Your brain of course needs glucose and your liver probably still has ...
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Can sleep be replaced by chemical supliments? [closed]

If adenosine makes a person sleepy to rebuild chemicals in the brain, than is it possible to inhibit adenosine and externally produce and inject the needed chemicals?
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1answer
142 views

What happens to the human brain when unconscious?

What part of the brain gets affected and does it harm the brain? Thank you I just needed some extra info for a video I'm making.
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What happens to the brain during sleep versus unconsciousness?

How does being unconsciousness differ from being asleep and whether it causes breaks in consciousness?
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Why doesn't the rest of the body have something like the “blood-brain” barrier to protect itself from pathogens?

According to Wikipedia: "The blood–brain barrier acts very effectively to protect the brain from most pathogens". This is because the pathogens cannot pass through the tight junctions of the ...