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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82 views

How does waking up from an alarm clock work?

During sleep, one's brain is shut down. All it can do is to see some dreams from the semi-conscious mind. Then how does it hear when the alarm clock rings?
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1answer
40 views

Are all tastes just a combination of sour, sweet, bitter, etc.?

For example, can the taste of pineapple be isolated to just a certain amount of "salty-taste-triggering-molecules" and "sweet-taste-triggering-molecules" etc.? Can our current understanding of the ...
7
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1answer
633 views

Why do humans alone have the capability to have religious/spiritual experiences?

What is it in our brain that makes having such experiences possible? I assume other species don't have these. Sure there are instances in the natural world where you can see individuals of the species ...
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2answers
78 views

How can neuronal signals faithfully be reproduced by scalp electrodes?

There is a skull barrier (and possibly other layers too) between the brain and the scalp. I have seen people trying to extract EEG signals from the scalp by connecting electrodes and interface it to ...
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0answers
27 views

Synapse formation [closed]

I am trying to learn about neuronal synapse formation, but the literature is intimidating to someone with little background knowledge. I am interested in synapse formation in both human adults as ...
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2k views

Can brain cells move?

I was discussing this with my brother. I'm pretty sure I read somewhere that they can move. Thanks EDIT: By movement I mean long distance migration (preferably within the brain only).
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1answer
81 views

Can brain damage caused by physical injury affect the social behaviour of a person?

Can a physical injury to the brain, resulting from an accident, and not the result of a diagnosed mental illness, affect a person's social behavior?
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1answer
47 views

Why does our mouth “water”?

Whenever we see something delicious, rapid salivation starts in our mouth. Also, it doesn't happen for all other food, which we eat regularly. So, Is there any particular use of "rapid salivation"? ...
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1answer
6k views

What are the advantages and disadvantages of being ambidextrous?

Most of us have one dominant hand. We find it nigh on impossible to do very delicate or dextrous activities with our other-hand. This seems like an apparent weakness, and a rather odd one when you ...
2
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1answer
52 views

Dreaming after passing out

I'll have few questions about passing out and dreaming. English is not my native language, and my biology knowledge is very limited. So bear with me. What exactly is blackout? (in a really simple ...
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2answers
145 views

Is there a difference between visual sensation and imagination in the brain?

How substantial is the difference between the neural signal associated with seeing an image and the imagination of that image? Surely, it can not entirely copy the pathway from the sensory organs to ...
6
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1answer
156 views

How does the brain recall information?

In computers, finding a single word is realized through serial attempts across all available connections to find a specified target. How does the brain solve this? How does the whole process, from ...
3
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2answers
522 views

When glucose production is low, the brain begins using ketoacids as energy… how does that work?

Can someone very generally describe how the brain consumes ketoacids/ketone bodies when blood glucose has been completely depleted?
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19 views

Human Brain at any waking moment is doing approximately how much “calculations” the way we measure Supercomputer Computation Ability [closed]

We have computer processors keep improving leaps and bound every year. I want to know how many "calculationsc are typically simultaneously done by human brain at any normal waking moment. It should ...
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0answers
27 views

What is meant by memory flushing? [closed]

Does this term mean movement of information from STM (short term memory) to LTM (long term memory), or this means removal of information?
2
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0answers
25 views

Acetylcholine and muscles- excitatory or inhibitory? (muscle atonia and myasthenia gravis)

I have heard that acetylcholine can be excitatory or inhibitory, but I am confused as to which it is when it comes to muscles. On the one hand, I believe that muscle atonia during REM sleep is ...
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0answers
136 views

“synapses grow closer together in order to decrease the distance”, is it true?

Is there a source? That synapses get physically get close as their interaction increases. I have also read that where neurons crosses each other they create new neuron, is that true?
3
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91 views

Loss of appetite during fever

It is a well-known phenomenon that sickness like the common flu is often accompanied by reduced appetite. Why do sick people stop eating?
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23 views

Access and decay time of long-term memory

As for STM (short-term memory), access time is 70 ms and decay time is 200 ms. Is there any calculated time for LTM (long-term memory) also? And does LTM really decay with the passage of time?
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1answer
23 views

Typical neuronal firing rates across the human cerebral cortex

I would like to find a scientific article (or articles), which would summarize typical neuronal firing rates in different parts of the human cerebral cortex. Any good references on this?
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1answer
98 views

Sensory adaptation regarding smell and hearing

Imagine the scenario. My friend and I are playing a game of chess near a highway. Initially, I notice the sound of the highway. While I'm playing chess, however, I do not notice it. After the game my ...
2
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0answers
19 views

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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0answers
36 views

Distribution of synaptic connections

What is the roughly the distribution of the various synaptic connections in the brain. Consider the following types: axoaxonic synapse between the axon of one neuron and the axon of another ...
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1answer
47 views

How the brain is affected by Alzheimer's disease

What exactly happens to the neurones in the brain? why can't they be repaired/restored? Why is it that there are so called 'good days'? What happens to the brain on such days?
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2answers
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Do we use 100% of our cerebral capacity?

I saw a movie yesterday called Lucy. In this movie, a girl called Lucy absorbs a large amount of CPH4, and her brain capacity slowly increases. So that brings me to my question which is : Do we ...
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3answers
126 views

Is NZT-48 real?

NZT is a fictional compound in a movie called limitless, basically it's a brain booster, it gives access to more simultaneous neuron activity. are there any real cognitive enhancers out there?
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2answers
989 views

Are Whales More Intelligent Than Humans?

Are Whales smarter than Humans? Their brain size leads me to think so.
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26 views

Are there different types of communication and computation neurons?

I know from my basic education in neurology that the brain has various sorts of neurons. These are usually bunched into 3 different categories. I read in a recently published book including papers on ...
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2answers
129 views

How do ascending neural pathways filter unimportant information?

In school they told us one of the functions of the ascending neural pathways is to filter unimportant information. But the neural signal I know, is only a chemical-electrical chain of neurons. Is this ...
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4answers
295 views

Can children restore brain cells?

By "children" I mean young people at the age of 10 or lower. I know that the adult brain cannot restore brain cells, but what about children? I mean, the brain must develop from a few cells to a 90 ...
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0answers
25 views

3D model - ant brain - precision and laboratory

I have some question. Is today's modern laboratory can perform high-resolution 3D model of the ant brain? This model would consist of a layer (sections 2D), which are made with a scanning electron ...
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0answers
10 views

How long can the brain function after cutting blood circulation? [duplicate]

If I cut blood circulation from the brain, for how much long can the brain fuction and send commands to the body like the legs?
12
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1answer
2k views

How does this illusion work?

I found this image on Google+ If you shake your head you can see a portrait of a person. Can anyone explain how the image is constructed in the brain?
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20 views

What is the decision making process when a bird builds a nest?

I have been watching The Life of Birds and I am rather startled by the ingenuity some birds show in building their nests. For instance, one species built a dummy nest on top with a secret entrance ...
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2answers
274 views

What were the symptoms of Phineas Gage after suffering his brain injury?

Phineas Gage was a construction worker who suffered a head injury due to an explosion at a construction site. A metal rod was pushed up his cheek and through his head. I have heard he demonstrated ...
3
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2answers
360 views

Can dietary monosodium glutamate intake induce restlestness?

The question is all in the title. More context: I like phở soup. I have noticed that I get restless after eating the phở soup at some restaurants. The effects are similar to the ones resulting from ...
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1answer
363 views

Is it a limitation of the eyes, or the brain, that we can't see a moving bullet?

Are the photoreceptors in our eyes not fast enough to register the fast moving bullet, or is the brain not powerful enough to make sense of something happening that fast?
4
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1answer
127 views

How small does a nanobot have to be to “swim through the brain” and access any neuron it wants to?

I read on this question What is in the space between neurons in a brain? that there is actually not much empty space in a brain. But my question is slightly different. Is there a visual demonstration ...
5
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1answer
155 views

Case study and speculations on the brain of Edward Mordake

I am very interested in the case of the man named Edward Mordake who lived in the 19th century. In particular, he had two faces. If you have not heard of this man, please, search this up as there are ...
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0answers
45 views

How does the brain store information? [duplicate]

In all electronic devices with the possibility of saving there are tiny magnets that can store your data by the state they are in. In general, there has to be something changed to store information ...
7
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1answer
454 views

Is the six-layer cortex model of the mammalian cortex still the most accepted model?

I've been reading a bit about the different layers of the cerebral cortex and its clear that certainly not every region of the cortex has the same number of layers. Thus, the idea that every region ...
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1answer
57 views

How does the brain regulate its temperature?

I recently ran into a bio-physical paradox while trying to solve an engineering problem, using nature's way as a guide; namely the brain. I'm working on designing a totally new system of liquid/gas ...
8
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1answer
215 views

What is the mechanism behind tinnitus?

I seem to have come across two contrasting explanations for tinnitus induced by loud noises- i.e. damage to the hair cells in the cochlea. On the one hand, I have read that damage to the hair cells ...
28
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1answer
4k views

Why is the brain white?

I have read many articles about how the brain is the most power-hungry organ in any living complex organism, requiring about 70% of it's oxygen supplies in the resting state. Since the usual medium ...
3
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3answers
227 views

Why is dopamine or a dopamine-receptor agonist not pumped into the brain of Parkinson patients?

I am aware that dopamine cannot cross the blood-brain barrier, but can't it be pumped inside the cerebrospinal fluid via some permanent tube implant? Wouldn't Parkinson patients chose that over ...
2
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0answers
40 views

Thinking quickly causes elevated mood

I read this article: http://www.sciencedaily.com/releases/2006/09/060926171045.htm It says, "When people are made to think quickly, they report feeling happier as a result. They also say they are ...
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0answers
103 views

Is dysharmonia an actual disease or something only Oliver Sacks believes in?

In his book Musicophilia, Oliver Sacks discusses a case involving a woman named Rachel Y. who lost the ability to process harmony in a car accident. He then explains how this lead to simultanagnosia. ...
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2answers
4k views

Which hormones can cross the blood brain barrier?

Can hormones such as testosterone, aldosterone and estrogen cross the blood brain barrier? I looked on Wikipedia and there no mention of it in the testosterone article. Through Googling around I also ...
3
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1answer
181 views

Is there a hormone combination that makes humans grumpy?

Imagine a typical situation that is likely to give rise to a bad temper within an individual: a person is awoken very early in the morning by a sound of a lawn being mowed next door. Unlike expected ...
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2answers
92 views

What would happen if brain neurons did not reduce their sensitivity to neurotransmitters after prolonged exposure?

From my understanding, neurons decrease their sensitivity to neurotransmitters by reducing the amount of receptors on the cell membrane in response to sustained neurotransmitter activity. One ...