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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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What makes dopaminergic neurons fire when maintaining base dopamine levels?

Are they signaled by other action potentials? Other neurotransmitters? Do they just fire on their own? If not triggered by an external stimulus, why does depolarization make them fire more frequently?
1600 Rager's user avatar
-4 votes
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24 views

non-myelinated nerve fibres in CNS [closed]

Do non-myelinated axons/nerve fibers exist in the CNS? Tried a few sources but got confused and now I don't know what to do if a question pops up in the examination.
Anirudh Agnihotri's user avatar
4 votes
1 answer
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Enigmatic picture of an axon

An image from Terrence Sejnowski's lab is around since at least 2015 when it appeared in an article about hippocampal spine head sizes and only recently (May 2024) in an article about synaptic ...
Hans-Peter Stricker's user avatar
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1 answer
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What would happen if somebody was administered caffeine while sleeping?

I know that drinking caffeine before sleep can disrupt your sleep and REM cycle, but I was wondering what would happen if hypothetically someone slept for 8 or so hours before being administered a ...
john papp's user avatar
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Does lack of mental activities reduce "function" of human brain?

On internet there is lots of text how the brain "reduces its function" if you dont use it. Quote from link: "In order to build connections between brain cells, and increase the ...
22flower's user avatar
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Nerve Impulse Process

In the process of re-polarization, when we have achieved the normal membrane potential, why does K+ voltage gate dont close at -70mv and rather at -90mv when its hyper-polarized?
Syeda Dua's user avatar
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0 answers
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Why doesn't the brain filter out tinnitus noise? [duplicate]

Human sense receptors quickly become insensitive to constant stimulation and even the human brain can effectively filter out and ignore constant stimuli. For example, people living by a busy road soon ...
Rich's user avatar
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13 votes
2 answers
2k views

Do the foldings in the brain vary person to person?

Can the gyri and sulcus, which are the foldings of the cerebrum, vary from person to person? If that is true, then can we say different people have different types of thinking skills? I believed that ...
Vidushi Aggarwal's user avatar
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Caffeine tolerance

I researched about caffeine tolerance and found out that regular consumption of coffe can build caffeine tolerance even if it's 1 cup per day, within few days or a week at most. Supposedly the body ...
AIŚVARYA SINGH's user avatar
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What is the most accurate polygenic score for Alzheimer’s disease?

To date, which polygenic score (i.e. which study) has produced the largest effect size for Alzheimer’s prediction in out-of-sample validation?
BigMistake's user avatar
1 vote
1 answer
54 views

Can a neuron produce electric or magnetic effect?

According to my view,As a neuron is an electrical impulse generating cell and through this impulse it carries information from brain to whole body or vice-versa, As here a very small electricity is ...
Vidushi Aggarwal's user avatar
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Can Neurons be connected in Series and will that pattern create huge voltage in human body?

We have learned in Physics that when multiple voltage sources are connected in Series , the resultant voltage becomes the summation of all voltages . Now, my question is - Can Neurons be connected in ...
Koushik Pal's user avatar
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Could an animal have a developed Broca's area but no Wernicke's area?

Broca's area's function is for speech production, specifically, the control of muscular movement for speech, and Wernicke's area's function is the comprehend language or communication, Communication ...
Woo Luke's user avatar
1 vote
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42 views

What is the extent of the CSF system out of the brain?

Does it spread sideways from the spinal cord at all? How far down does it go? I've found a lot of information about the spinal cord itself but not about the central canal, and more specifically if it'...
123's user avatar
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Is there such thing as "being aware of itself" at a cellular level, or is awareness only a multicellular thing?

It appears to me after a brief thought, that you need multiple cells to send and coordinate messages in order to have "self awareness". Basically, you need some sort of centralized brain it ...
Lance's user avatar
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Is there any research on episodic-like memory in reptiles?

I've been studying the area of episodic-like memory in non-human animals and our old reptile cousins seem to be really underrepresented (or not represented at all). Is there any research that I am ...
mandra mithra's user avatar
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50-400 bps consciousness: why do we draw the line there?

I have found studies that suggest the human consciousness can process 50 to 400 bps. The exact number varies, but it's always quite small. It is usually associated with some test results, but how do ...
Cort Ammon's user avatar
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2 votes
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Does binge watching cause sleep problems?

According to a study from 2017, binge watching is correlated with various sleep problems: The people who reported binge-watching were 98 percent more likely to report poor sleep quality compared with ...
Riemann's user avatar
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Why does Sanjay Gupta's brain look so unusual? (brain model shown on CNN) The subdivisions don't look like the lobes I learned in school

above: Screenshot from CNN's May 18, 2023 Feinstein’s office confirms broader health complications, contradicting senator’s denial below: from anatomyinfo.com's Parts of the Brain Neurosurgeon Dr. ...
uhoh's user avatar
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1 vote
0 answers
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How does brain activity change when focusing on something within peripheral vision, as opposed to the fovea?

Normally when looking around, we mentally focus on what we see within our fovea, as that is where we have the greatest visual acuity. However, it is still possible to focus (both physically with the ...
M S's user avatar
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6 votes
1 answer
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Is there a quantitative report for cortical homunculus?

Almost all websites that I see for cortical homunculus only show the final picture with some qualitative descriptions such as "hands have more dexterity and occupy more motor cortex." But is ...
Saeed Neamati's user avatar
3 votes
0 answers
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Happiness from sunlight is from IR or UV?

I found this study that shows that UV light makes our skin release feel-good endorphins. This is the pop-sci writeup. On the other hand, it seems like IR is what causes the sense of warmth in the skin ...
user3807846's user avatar
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Has the approach of any protein digesting enzyme has been trialled for Progressive Supranuclear Palsy against a protein accumulation in brain cells?

PSP -the degenerative disorder is attributed to accumulation of a protein in brain cells. Has any work been done to approach it by digesting this protein?
Vinod Kulkarni's user avatar
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2 answers
194 views

What is the evidence for cognition being mainly confined to the brain?

We believe that the processes of cognition are mainly confined to the brain. What is the evidence for that? I understand that the brain shows increased oxygen saturation in fMRI scans while thinking ...
Ritesh Singh's user avatar
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Are afterimages centrally regulated?

As I understand, negative afterimages might be induced by retinal cone bleaching or neuronal adaptation. I have heard that some experiments have suggested that afterimages can be centrally regulated. ...
an instance's user avatar
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Research surrounding visualisation (inner eye)

Aphantasia is the suggested name for a condition where one does not possess a functioning mind's eye and cannot visualize imagery. I have self-diagnosed aphantasia, so I might be asking a question ...
AzulShiva's user avatar
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6 votes
0 answers
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What is the share of body energy that the brain consumes? Is 20% reliable?

"20% of the energy at only 2% of the weight" is a frequently regurgitated factoid. More precisely, it should read: 20% of oxygen consumption. The problem starts when one looks into the ...
SeanJ's user avatar
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3 votes
1 answer
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Are there internal systems of organisms which acquired the functions which they were not evolved to perform?

In his research on the issue of belief formation Daniel Gilbert (1991. How Mental Systems Believe) claimed that cognition "is an evolutionary outgrowth of [perception]." What he meant is ...
David's user avatar
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0 answers
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When does a fetus become conscious?

I thought of asking this question in the Psychology & Neuroscience stack exchange, but I ultimately decided this would be a better stack exchange for it. When do the "lights turn on" in ...
user107952's user avatar
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0 answers
37 views

Unbounded synaptic weight in Hebb’s rule

I am new to neuroscience and apologies in advance if this is a very trivial question. I want to model the synaptic weights of neurons and using the discrete Hebb’s update rule $$w_{n+1}=w_n(1+c)$$ ...
abc's user avatar
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-1 votes
2 answers
88 views

Scientific terms for front-brain, mid-brain and back-brain

I am looking for a (semi-) scientific way of phrasing "front part of brain" (part 1), "middle part of brain" (part 2) and "back part of brain" (part 3) as denoted in the ...
gmut's user avatar
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1 vote
0 answers
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How does the central nervous system create the feeling of physical sensation in our consciousness? [closed]

I know sensory neurons that respond to light and physical sensations (pressure, temperature) exist throughout our body, giving us information about our surroundings. For instance, when I push the tip ...
bhp's user avatar
  • 19
2 votes
1 answer
194 views

Does beta-actin have to be consistent in Western Blots?

I have been running Western Blots on rat brain tissues from rats that have been subject to neurological disorders. I loaded the samples on the gel to ensure that for each tissue, I had a constant mass ...
mayurimahes6's user avatar
1 vote
0 answers
59 views

How does the female body sense its own pregnancy?

I understand that after the fertilized ovum attached in the uterus the female body will not produce the required hormone surge for ovulation the next month. Therefore no new ovum will be sent down the ...
Nicholas's user avatar
  • 111
-1 votes
1 answer
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Abnormally fast nerve conduction

Is there any neurological condition or disease where nerve conduction becomes abnormally fast? We know that myelinated neurons conduct impulses much more rapidly than non-myelinated ones as the myelin ...
Arkajyoti Banerjee's user avatar
3 votes
0 answers
44 views

Does any brain-computer interface model draw on neural temporal codes?

I am studying brain-computer interfaces (BCIs) and neural encoding/decoding for a class. Most decoding algorithms that I have encountered for BCIs tackling movement problems seem to assume a neural ...
EvC752's user avatar
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4 votes
0 answers
69 views

How widespread among mammals is the glymphatic system's metabolite clearance in the brain during sleep currently known to be?

The glymphatic system and "brain washing" (metabolite clearance) during mammalian sleep: Xie et al. (2013) Sleep Drives Metabolite Clearance from the Adult Brain (also here) has been cited ...
uhoh's user avatar
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3 votes
0 answers
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How is brain calorie intake affected after hemispherectomy?

So, I hear brain consumes 20% of the body's energy, and also according to studies people with only one hemisphere can function mentally fine with little to no problems. My question is, how does that ...
Hormoz's user avatar
  • 141
0 votes
1 answer
41 views

How to measure tone of the cerebral cortex?

There is a lot of information about the "tone of the cerebral cortex". Some scientific papers describe that the tone could decrease or increase. However it's not clear how do they measure ...
Diridu's user avatar
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0 votes
1 answer
125 views

What is the size of different mouse brain cells? [closed]

I am trying to isolate microglia from the adult mouse brain. I wondered if I would get pure microglia culture if, after homogenization, I filtered cell suspension through a 70um filter. But I could ...
Monika1223's user avatar
8 votes
1 answer
101 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 ...
spandan kumar's user avatar
1 vote
1 answer
71 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 ...
releseabe's user avatar
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4 votes
0 answers
75 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 ...
Jiminy Cricket.'s user avatar
4 votes
2 answers
252 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 ...
Matthew Christopher Bartsh's user avatar
-2 votes
1 answer
530 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 ...
user67614's user avatar
1 vote
1 answer
761 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 ...
Glubs's user avatar
  • 13
0 votes
1 answer
93 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 ...
qqqqqqq's user avatar
  • 111
0 votes
1 answer
79 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 ...
Aupakarana Abhibhaa's user avatar
0 votes
1 answer
253 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 ...
Justintimeforfun's user avatar
1 vote
1 answer
55 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 ...
Mike Serfas's user avatar
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