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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28 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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722 views

Why ambidextrous persons are so rare?

According to this article, only about 1% of all humans are ambidextrous: About 90 percent of people are right-handed, says Corballis. The remaining 10 percent are either left-handed or some ...
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Dopamine involvement in pleasure

There are some psychologists who believe that dopamine is not released during pleasurable activities but before them; my understanding is that a little dopamine is released pre-reward in order to ...
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5k views

Is there any danger in putting a magnet in your ear (next to your brain)

I recently bought some wireless earbuds that fit right in my ear, so they're very small. But the method it uses for charging is magnetic, so it has magnets built into the earbud. I was wondering if ...
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466 views

What is the exact frequency of Delta brain waves during Slow Wave NREM Sleep?

I saw a TED talk about researchers playing pulsating pink noise while a test subject is in Stage 3 Non-REM / Slow Wave / Deep sleep and observing an increase in Delta wave EEG activity. This seems to ...
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156 views

Does severing the Corpus callosum, effect the brain's communicating ability?

With serious epileptic seizures, a treatment is to sever the corpus callosum, which stops the seizures. However, does this affect the communicating ability between the two hemispheres? Or how does ...
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Is it possible to lose weight doing brain exercise?

According to this article human brain consume a comparable amount of energy with skeletal muscle. So is it possible to do some brain exercise (calculate something in mind etc.) instead of physical ...
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68 views

What happens to the language processing brain part if no language is ever learned?

Language is processed in the human brain in multiple regions. Some of them seem to be used exclusively or mainly for language processing, other regions are distributed overlapping with other functions....
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How does the brain’s limbic system work together to form a working memory, short-term memory, and long-term memory?

In the past few days, I was reading about the limbic system and how its components (hippocampus, hypothalamus, thalamus, etc.) cooperate. Among papers and forum posts I read about how those ...
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138 views

How fast the brain recover itself at sleep? What can be done to accelerate this process?

In Computer Science we have "Big O Notation" to describe how efficient is an algorithm at processing some task. Those can be linear, time constant, exponential among others. Using that analogy, How ...
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3k views

Ipsilateral vs contralateral side of body

I know that the dorsal columns carry ipsilateral information. Is this fact relative to the dorsal column in question? If I want to talk about the right dorsal column, then the right side of the body ...
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75 views

brain and fingers movement theorie

I heard somewhere that when we want to do a repetitive movement of one finger (ex the index) . Our brain (in a very crude way) sends a first message to move all the fingers, and then a second message ...
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Are male and female brains physically different from birth?

Male and female brains are wired differently according to this article: Maps of neural circuitry showed that on average women's brains were highly connected across the left and right hemispheres, ...
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Evolutionary explanation for hypoxia causing euphoria? [duplicate]

Why would something potentially very dangerous, such as hypoxia induce something pleasurable like euphoria? Are there any evolutionary hypotheses for this link? I'm thinking that something like the "...
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443 views

Why does excess dopamine activity in the pleasure centers results in less pleasure in schizophrenics?

According to the dopamine hypothesis of schizophrenia, there is an excess of dopamine in the mesolimbic pathway (nucleus accumbens), and this contributes to the positive symptoms of schizophrenia. I ...
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129 views

An introduction to nuclei in the pons?

I have a couple of questions regarding the nuclei in the pons, thus I figured it would be best to frame the main question in the way that I did. My main question, however, is whether the basal ...
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Reference request - Neuroscience of Free Will [closed]

I am a computer science student taking a course on philosophy. My topic of research is on freedom of will and whether it is possible to create a machine capable (or closely) of doing so. I felt that ...
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82 views

Since the matter in the brain is recycled every few days how does consciousnesses work?

Since parts of the brain are recycled every few days does that mean that materialistic theories of consciousness don't work?
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362 views

Where does the initial action potential come from?

When talking about action potentials we say that previous neurons caused an action potential in this neuron and that this neuron's action potential caused the same in further neurons. But what is the ...
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What in the brain has gone awry during sleep paralysis?

I experience episodes of what I assume is sleep paralysis (lasting ~ 10-30 seconds) a few times a year, where I'm conscious of being somewhat awake but unable to move. I can hear, but not see, and am ...
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159 views

Neuroscience of confusion

How does (neuro)science characterize "confusion" that occur to "healthy" persons when engaged on a particular mentally-intensive task? I would exclude the case where we are rationally and with clear ...
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62 views

Is it possible to affect a brain with electromagnetic waves? [closed]

A human brain can generate electrical signal. So it generates magnetic field as well. Is it possible to affect a brain with electromagnetic waves?
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125 views

Does the brain store information and personality traits in different areas?

I'm aware that muscle memory, language etc can remain largely intact after brain injury that impairs other forms of memory, suggesting that different kinds of memory are stored in different places in ...
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331 views

Cockroach brain functional anatomy

In insects like the cockroach the brain is distributed, i.e. some parts lie in the head and some in the abdominal cavity. Which part is responsible for controlling locomotion?
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Reference request: neocortex creating 11 dimensional structures

I've come across several pop science articles like this one that vaguely describe a method of analyzing brain tissue involving algebraic topology and 11 dimensional structures. They all seem to cite ...
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82 views

What is dendritic processing good for? [closed]

Can - on a very coarse level - the functional role of dendritic processing as a whole (at least one of possibly many functional roles it might play) be described as rewarding spatially coherent ...
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67 views

Simple model of dendritic processing

[I striked through some passages that might be misleading, resp. where I have been misled.] Is the following - very simplified - model biologically (or physically) plausible, explaining how ...
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101 views

Effect and functional role of voltage-gated channels on dendrites [closed]

I'd like to understand better the effect and functional role of voltage-gated channels on dendrites. What I believe to have understood: It is important that a more distal post-synaptical potential (...
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1answer
162 views

Number and function of voltage-independent ion channels

Googling for "voltage-independent" ion channels neurons doesn't give a good overview over the topic (and yields only approx. 50,000 hits, compared to 500,000 hits when searching for "voltage-dependent"...
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55 views

Does neural oscillation happen at the same frequency in all parts of the brain simultaneously?

Does neural oscillation happen at the same rate in all parts of the brain at a given time? I'm trying to learn and understand about brainwaves, and I know about the various categories of brainwave. ...
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1answer
740 views

Excitability of neurons

[The following includes a) two specific questions (at the end), b) an attempt to capture a dispositional concept (excitability) in geometric and physical terms.] I assume that "excitability of a ...
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119 views

How is “firing together” detected in Hebbian learning?

I assume, that the signal that forces a synaptic receptor/ion channel complex to change its behaviour (i.e. strengthening in the course of upregulation) must be the combination of the state of the ...
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How optimal are the distances of voltage-gated ion channels on axons?

In both myelinated and not-myelinated axon segments ("axons" for short) there are theoretically maximal distances of voltage-gated ion channels beyond which propagation of the action potential would ...
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Spatial distribution of axons connecting distant groups of neurons

It would help me to shape my picture of the brain, if I knew the following: Consider two specified groups of neurons A and B in the brain that are well-located but quite distant from each other (e.g. ...
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440 views

What is the difference between prefrontal cortex and frontal lobe? [duplicate]

They are both in the front. Looks like they're the exact same thing. Is one part of the other? What? Why is it called prefrontral cortex? What does pre before frontal mean? Before front?
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Homogeneous and complex nuclei

In the Wikipedia article on nuclei one reads: "The neurons in one nucleus usually have roughly similar connections and functions." I read this as "a nucleus usually is roughly homogenous", i.e. ...
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971 views

Why is the prefrontal cortex called such?

Pre means before. Frontal means front. What does cortex means? Brain? Is it the front most part of the brain? Is it located at the most frontal part of the brain and that's why it's called ...
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104 views

How some virus are able to reach the CNS?

I know that the lymphocytic choriomeningitis virus (LCMV) could provoke meningitis and encephalitis when this virus reaches the brain. However, there are other viruses like Varicella (VSV), ...
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Can memories intentionally be overwritten, or forgotten?

Over the years, I've come across studies (e.g., here, here, and here), and have watched documentaries (similar to this), that speak about memory retrieval, and how that, every time you recall a memory,...
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Is the shape of the skull important for brain size?

I do not know biology, but I notice that human skull have a particular form that is like a upward spike and other skulls which are only oval. upward spike: oval: I know that in the example images ...
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102 views

Neurons during Numb feeling

We become numb when there is short supply of blood to some parts, as mentioned here. If that is the reason, why don't neurons and other cells die at that part if they don't receive oxygen and other ...
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The colors blue and golden (yellow-orange) and the human eye / brain

Many years ago I read a review in an article about why we love for example Lapis Lazuli so much. The article stated that there are two specific colors, yellow as golden (when it glows or shines) and a ...
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If I receive dopamine only from doing difficult things will I eventually enjoy them?

I've recently read a post from reddit about how dopamine affects our motivation. Author states: Dopamine is pleasure. Your brain craves more pleasure. You get too much pleasure and your brain ...
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Longest pathway from sensory to motor neurons

How long is the longest pathway a neural signal can take starting from a sensory neuron and ending at a motor neuron (without loops)? [This is a purely theoretical question concerning only the ...
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337 views

Is it true that the human brain has not evolved in 100 000 years? [closed]

I read that the human brain has not evolved in 100 000 years and that's why there are no genes for intelligence.
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Can cognitive enhancement from exercise be replicated/replaced through prolonged standing?

Can cognitive enhancement from exercise be replicated/replaced through prolonged standing? Like, will BDNF be released from prolonged standing. I would prefer to use a standing desk than exercise (...
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The human brain in numbers II-A: synaptic connections per structural type [closed]

The overall number of synapses in the human brain is roughly 1,000 trillion, i.e. 10,000 synapses per neuron. I assume that each structural type of neuron (basket, pyramidal, ...) has a somehow ...
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What sections of the brain can be removed without causing instant death? [closed]

Years ago I've read about a young man you had lost a large section of his brain (frontal lobe) in an accident but surprisingly he survived it and continued his normal life. You may have read about ...
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128 views

The human brain in numbers II: synaptic connections [closed]

The overall number of synapses in the human brain is roughly 1,000 trillion, i.e. 10,000 synapses per neuron. My question here is three-fold: I assume that each structural type of neuron (basket, ...
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Alternative conditions for Liquifactive Necrosis

A person is beaten on the head hard enough to swell the whole front part of the head. The body is thrown into the river and recovered after about 36 hours. Is this condition enough for liquifactive ...

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