Questions tagged [brain]
The primary component of the central nervous system, which, along with the spinal cord, controls the body of bilaterally symmetrical beings.
512
questions
0
votes
0answers
5 views
Which part of the visual pathway does not change activity during microsaccades but changes activity upon pressing on the eyeball?
We perceive a page of text as stable while reading despite our eyes are moving considerably, but the image shifts quite drastically when we press on the eyeball. I am looking for a brain region which ...
7
votes
1answer
37 views
In evolutionary history, which came first - neuron or astrocyte?
As research is showing astrocytes role in information processing [1], I am interested in knowing which evolved first - an astrocye or a neuron ?
[1] Santello, M., Toni, N. & Volterra, A. Astrocyte ...
1
vote
1answer
66 views
There are some species that grow throughout their lives -- is there evidence that even in adulthood their brains increase in size?
One species I have read about is carp whose growth is limited only by food supply and space. One can actually, because their skin is almost transparent, see their brains and it sure does look like ...
4
votes
0answers
45 views
Newts in a rodent larder. Limits of regeneration? (NSFSqueamish)
Observation.
In the Surrey woodland of southern UK mainland I chanced upon a piece of corrugated metal. Lifting it up I found a bare patch of soil except for what appeared to be a nest of dry plant ...
4
votes
2answers
165 views
Why do animals with more mass tend to have brains with so much more mass when it seems like a similar mass brain should be able to do the job?
Why does a wolf have a brain so much bigger than that of a poodle, when a poodle's brain is big enough to do the job, I would have thought. Likewise, if tigers are not smarter than house cats, why do ...
-2
votes
1answer
62 views
How many signals can one neuron send and/or receive simultaneously?
I've been researching this question online and finding opposing answers. Some articles say that one neuron can only send one signal at a time while others says that one neuron can send more than one ...
1
vote
1answer
59 views
Is human skull size related to brain size?
Me and my dad have a disagreement about this. He thinks that if a person had a larger skull they would naturally have a larger brain. I think that he is assuming the evolutionary trend holds on an ...
-1
votes
1answer
58 views
What structures does our brain use for a quick indexing of all the data we store in our heads?
What structures does our brain use for a quick indexing of all the data we store in our heads?
From how my brains work (i.e. that I can very quickly recollect something from the past) I would say that ...
-1
votes
1answer
73 views
Intelligence of nervous system vs other human intelligence? [closed]
Viral proteins are shown to be used in intelligence such as for memory: https://www.sciencedaily.com/releases/2018/01/180111141450.htm
I wondered since proteins able to form prions are the most ...
0
votes
1answer
54 views
Why do colors clash in your brain?
Wen pairing two or more colors together, some "clash" or cause a effect visually where the two colors meet. To me it appears to be a black line between the colors or shading when in fact ...
0
votes
1answer
29 views
Is the central sulcus the boundary between basal and alar derivatives?
The dorsal part of the nervous system typically gives rise to sensory structures, and the ventral part gives rise to motor structures. Because the central sulcus marks such a functional boundary, I ...
3
votes
1answer
45 views
Are there regularly spaced connections between caudate nucleus and putamen?
There are a number of images on the Web, most beautifully Visible Body's artwork, which show the caudate nucleus and putamen linked by regularly spaced connections across the barrier of the internal ...
0
votes
0answers
40 views
Why did the dinosaurs not have gigantic brains and become really smart? [duplicate]
All my life, I've heard that all these gigantic dinosaurs that used to live on Earth had peanut-sized brains. I just accepted this as a fact, and I guess it may be a fact.
But now I wonder: why?! If ...
3
votes
3answers
220 views
Is there a difference between human neuron cells compared to those of other animals?
Thanks for looking.
Firstly, I am nowhere near biologist, just a student, so my apologies if this isn't a "good" question.
Background:
So I was searching about intelligence, brains and ...
1
vote
1answer
39 views
Read neural activity only having access to the brain from the "outside"
Is it possible to read neural activity from the outside of the head and if you had an machine learning algorithm that could learn what the signals "mean" (for example moving the right arm)? ...
-2
votes
2answers
57 views
How can animals that rely on SONAR not see color? [closed]
Humans can sense colors with acuity and can distinguish them because of the light of different spectrum that follows into their eyes. Not its also said that sound is different for different colors,
...
1
vote
0answers
37 views
How do brains find the peak/valley point on a curve?
It costs O(n) time if we find the max/min value in a number sequence with the length n. However, if we convert this sequence into a curve and find the peak/valley point with our eyes, it will use much ...
0
votes
0answers
19 views
Specified effect of trans cranial electric stimulation on neurotransmitters
Can a specific voltage from a trans cranial stimulation activate specific neurotransmitter receptors or channels? By specific, it means receptors dedicated to specific neurotransmitters such as ...
1
vote
1answer
294 views
Is there an 'opposite' neurotransmitter to dopamine?
Dopamine is a neurotransmitter (i.e. chemical) in the brain that gives us great feeling. From here:
Dopamine plays a role in how we feel pleasure. It's a big part of our unique human ability to ...
4
votes
1answer
148 views
Why do women have less synapses / neurons / brain mass than men despite having the same average IQ?
I don't mean to cause offence or suggest than men and women shouldn't be of the same intelligence — that's not something I'm here to dispute. What I want to understand is how this is possible given ...
0
votes
1answer
49 views
Differences between comatosed states and brain death
What are the neurological, physical, etc. differences between someone who is in a coma (one that is not medically-induced) and someone who is colloquially deemed "brain dead" (being ...
1
vote
0answers
36 views
Brain centers vs areas (and how they relate to nuclei)
I'm looking for a reputable source that can provide succinct definitions differentiating the following terms in the central nervous system (CNS; particularly in the brain):
Area
Center
Nucleus
...
0
votes
0answers
57 views
How are thoughts biologicaly generated?
I want to know how thoughts are biologicaly generated. I know that electrical impulses can trigger formed memories in the brain but what I want to know is how the electrical impulse is generated in ...
-2
votes
1answer
73 views
Can we decode memories?
Premise: I don't have a strong background in neuroscience or human biology, so I would ask you to answer like you would at a 5 years old child. I have done a couple of research on the web, as well as ...
0
votes
0answers
17 views
Is there a word that describes symmetrical correlations between a damaged brain region and behavioral disability?
Specifically, I'm looking to address phenomena such as (1) how damage to only one side of the substantia nigra leads to Parkinson's symptoms on only one side of the body, or (2) retinotopy, how ...
2
votes
1answer
73 views
Why is gyrification advantageous?
Standard 'Explanation':
I've seen countless neuroscience articles and experts explain that 'cortical gyrification is advantageous because it increases surface area which obviously increases your ...
0
votes
0answers
18 views
Is the tip of the temporal lobe the "top" of the brain neural tube?
The neural tube that forms the central nervous system forms around a cavity that becomes the ventricular system. Is the end of the lateral ventricles in the temporal lobe the top of this original ...
2
votes
1answer
94 views
Can scientists "see" thought?
Touching an object activates a nerve - something that can be observed by scientists.
Scientists can also trace the resulting "signal" through your nerves to your brain. They may know which ...
1
vote
0answers
45 views
Biological Neural Network Modification to Unlearn Understandings [closed]
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 ...
0
votes
0answers
24 views
question on brain dissection
I was dissecting a sheep's brain for my students and one of them asked a question about the corpora quadrigemina he asked why did two of them(the superior colliculus) look more red than the other two ...
-4
votes
2answers
356 views
Single cell organism's brain [closed]
Multi cellular organisms have brain.But what about single celled organisms do they have brain to control the cell's work?If they have something what that part called?You can say that the nucleolus do ...
7
votes
3answers
1k views
Biological Neural Network Training for Babies [closed]
I am concerned by the fact that babies cant walk because the muscles in their limbs arent developed and tuned to give directional control, it takes years before babies gain mobility and dexterity. So ...
1
vote
0answers
31 views
Difference between Processing and Preprocessing
In the wikipedia article of emotion lateralization it is mentioned:
The right hemisphere is important for processing primary emotions such as fear while the left hemisphere is important for ...
5
votes
0answers
43 views
Parts of Brain Active for Dreams | Right Hemisphere or Cortex
I found a research that states cortex is responsible for the contents of the dream. Contents could be people, place, objects etc.
The cortex is responsible for the content of dreams, including the ...
4
votes
1answer
59 views
Can potassium ions depolarise neuron membranes?
I am reading a journal paper about the cell adhesion molecule NCAM2 and I have come across the following statement:
To confirm the functionality of the reporters, neurons were time-lapse
recorded ...
0
votes
3answers
272 views
If due to some reasons a small portion of our neurons die, how does our body remake them?
There are various reasons such as intake of neurotoxins, and possibly traumatic injuries, that can cause neurons to die.
After several hundreds, or thousands of our neurons die, how does our body ...
1
vote
1answer
57 views
Is new idea equivalent to forming new synaptic connection?
We get new ideas quite frequently hence I am curious that is getting new idea equvant to formation of new synaptic connections? I am aware of neural plasticity but somehow doubt that it happens quite ...
0
votes
0answers
28 views
How reward / penalty is comprehended?
Technically brain is composed of billions of neurons for abstract computation of the world around us. I am bit confused that how does emotions such as fear/anger gets simulated by amygdala, which is ...
1
vote
1answer
45 views
Does GABA enhance or inhibit negative effects of glutamate? [closed]
A study on NCBI studied the correlation between a depressive mood and chronic pain. I researched this because today I noticed unusual emotional volatility as a result of 2 days of acute back pain ...
2
votes
1answer
45 views
Are the transitions between the different brain frequencies states easy to see on an EEG?
Are the transitions between the different brain frequencies states: Gamma to Beta, Beta to Alpha, Theta to Delta, etc. easy to distinguish on an EEG? How quickly can the brain transition between any ...
-1
votes
1answer
50 views
Do neurons with dopamine inside only send signals to another neuron with dopamine?
A nerve cell with dopamine receptors gets an action potential and releases dopamine to other neurons. Does this nerve cell only release to cells with dopamine inside? Because what if a neuron has a ...
-3
votes
1answer
127 views
What percentage of the brain is memory | Storage of thoughts, episodes
I was reading the article, in which it is mentioned that human brain constitutes 2.5 petabytes of memory. This made me wonder how much of the brain is associated with memory itself. If we categorize ...
1
vote
0answers
44 views
Does too much screen time really damage your brain? [closed]
So I was looking on the internet for articles to whether computers really damage your brain and I found that half of them say the do and the other half say the don't. Personally I don't think it does ...
1
vote
1answer
68 views
How much oxygen does a brain consume?
I am not a biologist - my background is in quantitative sciences, and I am trying to answer a rather quantitative question:
How much oxygen does a brain consume?
This however raises many sub-questions ...
11
votes
0answers
133 views
How do the biophysics of how cerebrospinal fluid mechanically protects the brain work?
The two mechanisms I've seen mentioned are the cerebrospinal fluid (CSF) acting as a hydraulic cushion or shock absorber, and how CSF creates a micro-gravity environment through buoyancy.
I have very ...
-1
votes
2answers
98 views
Evolution: what were we doing for 100.000 years? [closed]
I'm not a biologist/anthropologist but there is a question that comes up again and again and which I couldn't find any deeper thought, even not a speculation. As far as I understand it, according to ...
1
vote
1answer
74 views
What exactly is "lateral septum"?
I came across the phrase lateral septum and I can't seem to find the precise definition online. Is it "the areas roughly to the right and the left of the septum pellucidum"? Or is it the ...
0
votes
1answer
37 views
What are "intrinsic hypothalamic fibers"? (From an article on neuronal mechanisms of sexual desire)
I came across the phrase intrinsic hypothalamic fibers which I cannot understand. What is meant by intrinsic - that these fibers (long myelinated axons?) start in the hypothalamus? Or that they start ...
2
votes
0answers
35 views
Does acuity of a re-mapped region of cortex depend on the need of the animal to resolve between two closely related stimuli?
From my informal research so far, I've learned that cortical magnification is evident in at least the visual cortex and the somatosensory cortex.
My question is the following:
If there were a ...
1
vote
0answers
186 views
Why do we get tunnel vision during fight or flight response?
I have a question regarding tunnel vision during the fight or flight response. I believe that during fight or flight high levels of adrenaline are released which causes the pupils to dilate allowing ...
