Questions tagged [brain]

Tag for questions regarding the brain. The brain is the portion of the central nervous system that is located within the skull. It functions as a primary receiver, organizer, and distributor of information for the body. It has a right half and a left half, each of which is called a hemisphere.

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How are neurons able to effectively communicate when there are way more dendrites than axons?

Neurons can have up to 100,000 dendrites and typically only have a single axon. This means a neuron typically has a very large number of inputs while only having a single output. Surely you can see ...
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What is the permanent effect of sleep-deprivation on the brain and its cognitive function?

I know that many teenagers suffer from chronic sleep-deprivation. This varies from country to country, but it is widely known that especially students suffer from this condition. Most have a mild form ...
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Mammals with highest synaptic pruning

After human, which kind of mammals have highest degree of Synaptic pruning?
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Does our brain unconsciously keeps track of time?

I’ve had multiple experiences lately where I didn’t look at my phone for a while and then right before I looked I made an approximation of the time and most of the time that approximation was right to ...
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Why is intensive mental activity so tiring if it just spends a bit more energy than in relax?

As far as I know intense mental activity supposes spending about 1% more energy than what you would spend by basically making no real effort in any mental activity. If that's the case, why is so ...
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How do psychedelics work? [duplicate]

I realize my question is more of a pharmacological one than a neuroscientific one, but I didn't know where else to ask this question. As far as I've read, there's two components to how psychedelics ...
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The “Triune brain” model is obsolete, what is the name of the model that replaces it?

The Triune brain model suggests our brains evolved adding more layers, a lizard brain, then a mammal brain, then a new human brain. As that's false, and the same structures have become modified in ...
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62 views

Can the human brain be simulated by a computer?

There is a Wikipedia page on brain simulation, but: Question: Could there be (experimental) evidence that the (human) brain cannot be simulated by a computer? Note that the Wikipedia page Mind ...
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What are higher-level and lower-level brain functions?

The human brain can be described as a "Russian nesting doll" in the sense that the most ancient areas of the brain responsible for lower functions are located at its centre while newer ...
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72 views

How does the brain interpret electrical brain stimulation?

I believe I understand the natural path, in which stimuli appear and by neural plasticity our brains "learn" these stimuli. I recently learned about electrical brain stimulation and I was ...
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Where to find modern theories on how the brain computes inputs and information [closed]

I am a software engineer with a special interest in machine/deep learning and I have a fair amount of experience in this space. In (supervised) machine learning, you are tuning a (very) large data ...
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Do neurons have a single transmitters vesicle per synapse they have?

Do neurons have a single transmitters vesicle per synapse they have? So when they will be activated, each transmitter vesicle is going to one synapse. Or is it that neurons release some amount of ...
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Do all neurons have a “job”, or are some waiting to be assigned for a novel stimuli to appear?

Do all neurons have something to do (i.e. all are activated for some known stimuli), and when a novel stimuli appear some of them change in some way so we can learn it? Or is it that we have "new&...
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How does pattern separation works?

I found an article that stated: "Researchers think neurogenesis helps the brain distinguish between two very similar objects or events, a phenomenon called pattern separation. According to one ...
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56 views

How do neurons know where to send transmitters?

If a single neuron can have thousands of synapses with other neurons, how do each neuron "knows" to which further neuron to send transmitters? i.e. selectivity
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Reaction when light is turning on and off

This question comes from a personal experience I've had over the last few days, 'experimenting' on my own. I have a light bulb in a room that is turning on and off periodically, let's say per second. ...
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In principle, could a brain be rewired to experience more pleasure and/or pain?

I'm not sure if these are two separate questions, but I'm curious: in theory, could an existing adult mind/brain be modified to perceive pleasure/pain signals more intensely than otherwise? Without ...
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Mechanism of ECT [closed]

What happens within the brain structure when ECT is given ? What are the changes occuring physically as well as neurologically ? Has there been any research into this matter ? Of not , why ?
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Could you inject external gamma waves into your brain safely?

I've recently taken up the study of neurology, and I was wondering if you could create a device that would input gamma waves into your brain. And if it would be safe. Suppose you had a device that you ...
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From a general perspective, why are we more likely to remember wanting to do something, but not specifically what it is?

I have experienced several mind pops and instant recalls based on triggered events, and some might come suddenly, or they might gradually appear. Sometimes, though, I remember something that I would ...
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how does our brain know how to provide the right instructions to pronounce words?

Children learn to speak by hearing others and then trying to pronounce these words. What I don't understand is: how does their brain know the right instructions to give to the tongue, lips and the ...
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Biological Neural Network Modification to Unlearn Understandings

Lets assume that a person grows up thinking that religion X is true religion. So he builds up a profile in ones head and when notion of religion X appears the neurons that is related are fired, giving ...
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What lies at the core of human brain's processing, is it a simple retrieval from memory or actual computation?

For example, let's say I am solving a tough Calculus problem, as is my friend. I have practised calculus problems for several months now. While my friend is new to it. So, I solve it easily while my ...
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Cerebrum and Cerebellum split?

What happens when cerebrum and cerebellum are surgically separated (or partially separated)? Is this lethal, and if not, what are consequences for brain operations?
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What is the size, volume, dimensions etc. of the central lateral nucleus in the anterior intralaminar thalamus in humans?

I have been searching extensively on the internet and journal articles for the size, volume, dimensions, etc. of the central lateral nucleus in the anterior intralaminar thalamus in humans but have ...
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2answers
523 views

Does the mind create the body?

Everything we perceive is through the 5 senses. That means the body which is perceived through sense of feeling and seeing is also formed as an image in mind or brain? Is it correct that it is either ...
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Function of the Left Medial Prefrontal Cortex

I am searching for a specific (as specific as is currently known) region of the brain that has a known(?) large role in deductive and inductive reasoning. My research has narrowed me down to the Left ...
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Is dreaming the data compression of the brain?

Dreams seem very similar to data compression in a computer like a zip-file. We gather a huge pile of data throughout the day and when we rest, we compress this raw data into chunks of similar data (...
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Can subvocalization during reading be totally done away with?

Speed Reading Tips: 5 Ways to Minimize Subvocalization suggests that " study after study shows that eliminating this habit completely is not possible." Is this true? What are some of the ...
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What do we know about actual limits of wire heading in humans?

Reward hacking, or wireheading, is a recurring theme in the Reinforcement Learning and Artificial General Intelligence literature, where an agent learn to exploit the system to maximise reward. What ...
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1answer
56 views

Is there a Brain Mechanism for Reluctance of Studying?

For example, it could be the case that a person has less Acetylcholine, a key hormone that enables/helps to establish connection between neurons, so, the person has to go through more hardship to ...
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234 views

Are there cases of drug addict that “forget” their addiction after some brain damages?

I'm interested in what I naively call "memory of addiction" - i.e. the brain restructuration that drugs addicts have and which causes the addict to need more and more to be satisfied. Then, ...
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19 views

What does it mean if you are in a sleeping state and you hear a sound that your brain is immediately aware of?

When you are in a sleeping state ,i.e.lying in bed before your alarm clock rings, and you hear a noise or a voice that is not too loud and is not continuous but impulsive, and your brain immediately ...
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54 views

What happens inside the brain when we concentrate?

What happens inside the brain when we concentrate (meditate), and why does a person find it difficult to continuously concentrate for a long time? That is, why does one need a break after working or ...
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Brain network datasets

I am a student from Computer Science and interested in graph theory. I was looking for datasets for brain networks (structural and functional) for graph analysis. I have found brain image datasets ...
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What is the scientific evaluation of the Grain Brain hypothesis?

The Grain Brain hypothesis states that the consumption of gluten (and grains in general) produce long-term neurological damage. It's been proposed and popularised by neurologist and best-selling ...
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Is there a neurological difference between someone experiencing a “normal” trauma response, and someone with PTSD? Or are they on the same continuum?

I've been reading Dr. Bessel van der Kolk's book The Body Keeps the Score. Dr. Van der Kolk describes how, in people with PTSD, the brain actually undergoes changes in response to trauma. Their ...
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Measuring serotonin in the brain with a sample of spinal fluid

Is it possible to measure serotonin with a sample of spinal fluid?
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Why is the occipital lobe behind instead of in front?

These are regions of our brain: Our eyes are in front below our forehead, however, the visual area Occipital Lobe is behind. Are there any biological reasons for this? why shouldn't Occipital Lobe be ...
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1answer
63 views

Do people who experience heautoscopy become unable to see their reflected image in a mirror?

I understand that people who experience autoscopy can see their body image outside them without a mirror. I had read many years back in a paper that people who experience the inverse phenomenon called ...
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Is it scientifically backed that sensory signals always go through limbic/emotional brain system?

From the book Emotional Intelligence 2.0 by Travis Bradberry & Jean Greaves: The daily challenge of dealing effectively with emotions is critical to the human condition because our brains are ...
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45 views

How action potential is generated while dreaming

I would like to know what generates the action potential in the brain areas that is relevant to dreaming, since our sensory nervous systems don't work (or do they?). What else can generate the action ...
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Question about the role of the sensory receptors compared to the sensory cortoces

I have two questions regarding the fact that each sensory receptor has its specific ion channels that open in response to a specific stimulus (for example, ion channel that opens when streching for ...
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If everything that I do gets represented statistically, then would my non biological version be considered real or artificial? [closed]

That is if my entire brain gets modeled both atom by atom and functionally in a virtual environment, then would my replica be considered artificial?
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Neurotically, what is the difference between learning/memorizing and understanding?

I'm trying to understand how our brains - neurons or other chemical processes work in regards to learning/ memorizing and understanding. I found a lot of "theoretical" discussions on the topic- e.g. ...
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Is exercise considered a 'fight-flight' situation by our brain?

When you do heavy exercise like running, your heart rate, and breathing increases, is it because of the sympathetic nervous system controls it? Or the Sympathetic nervous system only activates on the ...
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2answers
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Would an electroencephalogram detect a chip in you brain that is sending signals?

To clarify the question, if you had a chip inside your brain that is sending bytes via wi-fii, bluethoot or other kind of waves, would the encephalogram detect anomalous activity? Are the waves ...
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1answer
31 views

Satisfaction from music due to correct prediction of a sound

Ive randomly thought about a vague idea that perhaps the satisfaction I experience when listening to music is due to my brain correctly predicting a next sound in a sequence. Do you think that has ...
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Question about the left-brain interpreter characteristic

I got to know the concept that the left hemisphere of the brain has the ability to infer conclsions about the world, even if the information on which it relays is not necessarily valid, from ...
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Which part of the brain “lights up” most consistently when someone is watching cartoons?

I have a vague memory of learning that there's a consistent part of the brain that "lights up" when someone is looking at a cartoon rendering rather than a photo. Which region would this be?