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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26 views

Can sleep be replaced by chemical supliments? [on hold]

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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34 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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35 views

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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1answer
59 views

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 ...
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10 views

Detecting brainwaves with no direct contact and no electrodes

Brainwaves are low frequency waves which is hard to detect and can be interfered with radio waves.i heard that it is possible to detect it with radio telescope and can be analysed with computers and ...
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1answer
502 views

Does breath-holding cause permanent brain damage?

My question is: Does voluntarily holding your breath at atmospheric pressure for a few minutes can cause brain damage? I'm talking about periods of time around 3 minutes. I've read there are some ...
3
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1answer
55 views

How can neurons divide without centrioles?

I have read in my studies that neurons lack centrioles. If that is so, then how is it possible that new neurons are added to our brain? Does this have anything to do with memory loss?
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311 views

How do duplicate brain regions (ex: left/right amygdaloid body) operate together?

I frequently hear talk about parts of the brain like "Amygdala" or "Hypothalamus", so I looked them up in an app called "essential anatomy". What I see is that there's mirror symmetry, and most of ...
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5answers
945 views

Can the human brain be reduced to a binary system?

Does the brain really function like a computer as in, ultimately every response is related to a binary sequence based on whether particular neurons fire or not?
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1answer
44 views

How long does a spiking signal last?

It is surprisingly hard to find information about the timing of neurons, in particular how long an action potential can contribute to the summation of a neuron. Is it on the order of milliseconds or ...
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25 views

Brain capacity of Cro-magnon man vs Modern man

Cranial capacity of Cromagnon man was about 1650cc whereas average cranial capacity in modern human is 1450cc. My question is, why during the course of evolution, a reduction in cranial capacity is ...
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25 views

How were (many) dinosaurs' brains so small?

Brain size (or its proxy, encephalization quotient) usually varies allometrically with mass -- larger creatures need larger brains to control their larger bodies, apparently. Dinosaurs are popularly ...
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1answer
33 views

the evolution of the human brain size [closed]

I was thinking, as I know, sometimes the process of producing DNA did not work well(correct me if I'm wrong), so it gives us some changes in the object we gonna ...
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1answer
15 views

“Next generation” brain scanners, can they detect CTE?

I've just read the news that a "new generation" brain scanner is under development. I wonder whether they can detect chronic traumatic encephalopathy. I haven't been able to find the paper about these ...
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2answers
174 views

Understanding the brain: how are neurotransmitters released in the brain?

I have a basic knowledge of how neural networks work. A potential difference is created that forces sodium, potassium, chloride, and calcium ions to flow which carries an electrical signal to the end ...
4
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2answers
125 views

Headshot = instant kill? [closed]

While whatching a film, I've been thinking about how does a headshot kill someone, and how long does it take? For example let's say you've beeing shot by a normal (police) handfired weapon - no ...
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2answers
3k views

What “emotions” can a snake feel?

Short: Thinking in particular of a Royal Python (US: Ball Python) such as some people keep as exotic companion animals, what sorts of "emotions" or "feelings" are they capable of? Long: ...
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1answer
45 views

How does the brain train its neural network?

One question that came up learning how artificial neural networks are working was how the brain can train its neural network? When we say we have an artificial neural network, the problem behind it ...
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24 views

Is there an equivalent to a refresh rate for the brain and consciousness?

Computers have a clock rate that synchronizes their processors. In spite of tempting analogies, the brain is clearly not simply an organic computer. It is constantly changing, rewiring and pruning its ...
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30 views

Transcranial Magnetic Stimulation on science fair [closed]

My friends and I would love to make a TMS machine and apply it to make famous "god helmet". We know that magnetic stimulation may cause visions of angels, gods etc. My question is: what are the ...
4
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0answers
25 views

Does Alzheimer affect more than day-to-day memory?

I know that Alzheimer's damages a part of the brain called the hippocampus, which has a central role in day-to-day memory. But, could it affect also on things in other memory centers, things such as ...
2
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1answer
153 views

Biological implementation of convolutional neural networks

In computer science, 'convolutional neural networks' are used, that are meant to be inspired by biological network structures like found in the human brain visual cortex. In the computer ...
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3answers
3k views

3D models of adult male brain in the Blender software? Any open-sourced version for research?

I am trying to find 3D model of brains. I am particularly interested in adult-male -brains in Blender-model. I could find such 3D models of brains for sale here but because I am researching I would ...
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0answers
52 views

How would a human brain change if it existed in isolation? [closed]

How would a human brain change if it didn't receive any signals for a longer period of time (e.g. 1 month)?
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0answers
94 views

What are the dangers related to keeping a human brain alive outside of a human body? [closed]

I am interested in learning about the feasibility of keeping a human brain alive outside of a human body. The question: What obstacles do we need to overcome to be able to keep a human brain alive ...
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5answers
12k views

Why do the two hemispheres of the brain control the opposite sides of the body?

Why does the left hemisphere control the right and the right hemisphere control the left? I googled it but didn't find a good answer regarding this. Could someone explain? Does this adaptation help ...
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1answer
40 views

What physical or mental actions can be picked up by EEGs?

There certainly seem to be a lot of gadgets and gizmos leveraging EEG technologies to the control of devices. This makes me wonder: what intentions/thoughts can be captured by EEG technology, and ...
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1answer
69 views

What were the main discoveries in Biology? [closed]

What were the greatest achievements in Biology? Can you please provide a short list of discoveries that you would consider as being the most important discoveries of the history of Biology.
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27 views

How is the brain kickstarted during development [closed]

The brain is a complicated beast, that operates (generally) by electrical activity. During development, all cells originate from the a single "cell": the zygote. At some point during development, the ...
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15 views

How to use the 10-20 system of placement with 3 leads in EEG?

I am trying to get EEG signals using a homemade circuit. I have 2 active electrodes and a reference electrode. My question is, can I implement the 10-20 system of electrode placement by connecting the ...
4
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2answers
144 views

Brain wave and motor movement correlation

I am trying to better understand which brain waves are generated when the motor system (arms, legs, muscles of any kind) are activated. According to Wikipedia, several types (Beta, Gamma, Mu) appear ...
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0answers
42 views

What is meningitis? [closed]

I know that meningitis is the inflammation of the meninges surrounding the brain and the spinal cord. But I still don't understand this definition. If you can broaden the definition, please do.
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1answer
86 views

Deducing synaptic strength from electron micrographs?

There are several promising techniques for connectomics based on iterative sectioning and imaging of tissue with scanning electron microscopes (e.g. FIB-SEM and ATUM) By looking at such micrographs, ...
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0answers
39 views

why does brain produces noise? [duplicate]

when i look at a white wall i see little colored dots moving in circles filling my whole visual view, just like the static on a tv but then in color. I thought everybody had this but recently i ...
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10 views

how to see prefrontal cortex works normally by a test?

Is there a test to see if the Prefrontal cortex of someone works normally? especially a simple test like a questionnaire that you give the individuals to fill out and based on their answer you obtain ...
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1answer
93 views

Synaptic pruning and selective elimination during adolescence

How does Synaptic pruning occur during pre-adolescence, adolescence and post-adolescence, after there is blooming overproduction of synaptic connections until the years of late childhood, and how does ...
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1answer
90 views

What is the role of the tissue surrounding neurons in decision making and taking control of impulses?

How does the fatty tissue surrounding neurons supports and enhances the speed of electrical impulses? How does it stabilize connections that take control of impulses and decision-making? The cells ...
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1answer
103 views

How does the brain manifest and realize the intention to resist sleep?

The question title says it all. What happens in my brain when I resist sleep? I would appreciate explanations on neurotransmitter changes, what areas of the brain activate to resist sleep, what can an ...
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1answer
35 views

Examples of seeking behavior by brainless animals

Are there any examples of brainless animals (e.g. jellyfish) exhibiting seeking behavior, such as following smell or light gradients towards food, or following hormones towards mates?
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1answer
53 views

Nernst equation?

I keep seeing the Nernst equation in two different forms, one using the natural log and the other using log base 10. Could someone explain why there are two different versions, and which should be ...
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0answers
28 views

Atlas from human brain structures to 3D coordinates?

I would like to visualize specific human brain structures in the three dimensional space and compute specific geometric properties of these brain structures (size, centroid, etc). Therefore, I am ...
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0answers
9 views

Is there a joint on a brain connecting both inner speech and outer speech sensation?

I'm interested of the neurophysiology of the inner speech/inner voice aka. auditory thinking. This question is similar to: What are the common neural circuitries between visual sensation and the ...
2
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0answers
37 views

How do Binaural Beats Work?

We have a project on different ways of relaxation. One way I found out was binaural beats. Could anyone please tell me how they work. You guys are masters when it comes to simplifying things! All I ...
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0answers
48 views

Why do we have two brain hemispheres? [closed]

Is there any explanation why we have two brain hemispheres? Is there any advantage of having two in contrast to having one (or three / four)? From what I've read so far (not too much; I'm not a ...
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0answers
27 views

Is there any evidence to suggest that exercise reduces the side effects of caffeine?

I heard a friend say: I'm not drinking coffee this week. My body can only process the caffeine if I run at least 15km a week. I found this claim fascinating - that exercise temporarily ...
2
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0answers
112 views

How much should one smoke in order to prevent Parkinson's? [closed]

There are studies who claim that nicotine has a neuroprotective effect against Parkinson's(such as this: http://www.ncbi.nlm.nih.gov/pubmed/11772120) What would be the minimum amount of ...
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0answers
39 views

Of people who develop Alzheimer disease, are those people genetically predisposed to it?

I have read a lot lately about microbiological pathogens that are found in blood vessels in the brain of patient's with Alzheimer disease (positive association). So, I am confused whether there are ...
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0answers
57 views

Does recovery time after a concussion really prevent CTE in football players?

I just watched Concussion, which introduces the discovery of a brain disease called CTE due to head trauma, and in looking at the NFL's response to the issue of CTE, one of the primary solutions I saw ...
2
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0answers
10 views

Is there an evolutionary reason why so many white matter tracts decussate in the brainstem and spinal chord?

From a developmental perspective, I would tend to assume that it would be much simpler for the fibers descending from (for instance) the pyramidal tracts, superior cerebellar peduncles, or ascending ...
2
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1answer
83 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?