Questions tagged [neurology]
The medical specialty involving the diagnosis and treatment of all categories of disease involving the central, peripheral, and autonomic nervous systems, including their coverings, blood vessels, and all effector tissue, such as muscle.
141
questions
-2
votes
1answer
21 views
Alternative hypothesis for learning in brain beyond the hebbian rule
I was reading on wikipedia that there are exceptions to the hebbian rule, and I was curious about the possibilities of other hypotheses of how learning occur in the brain. So I would like to know:
...
-3
votes
0answers
38 views
Can the brain alter how our genes expressed? [closed]
I have been wondering something , in theory , if there was a way to infulence the brain / subconsious mind to alter genes, expression , would it be able to? There is a biologist, bruce litpon that ...
5
votes
2answers
62 views
How do anticholinesterase pesticides kill nematodes?
Compounds that inhibit the enzyme acetylcholinesterase are commonly used as pesticides. In animals with centralized respiratory systems controlled by the nervous system, poisoning with an ...
-2
votes
3answers
83 views
If the Brain can store as much information as a billion hard disks why cant i memorize a single word document of random letters?
I read a lot of articles on this and all seem to agree that the brain storage in neural connections is tremendous but that doesnt explain why we forget things so easily and have such a modest memory ...
1
vote
0answers
15 views
Is downregulation of neurological receptors fully reversible, i.e. complete upregulation and resensitization?
Are down/upregulation truly reciprocal mechanisms? After a binding ligand or agonist is removed, such as a prescription medication, is upregulation and resensitization able to occur to a level that ...
1
vote
0answers
15 views
static versus dynamic equilibrium when bending over
When a person stoops/bends over, is the equilibrium functioning static equilibrium or dynamic equilibrium? I am not sure, because on the one hand the person is not moving (static), however, his/her ...
2
votes
1answer
39 views
Can a brain be damaged by overstimulation?
I am wondering what, if any, long term health effects there are from high levels of brain activity.
I don't mean cases where a brain is being artificially stimulated, but rather where there is a high ...
3
votes
1answer
55 views
How does an electrical impulse spread in a muscle fiber spread from the motor end plate?
Does this impulse in skeletal muscle spread much in the same way it does in neurons, with an initial potential change that spreads to its immediate surroundings and is then re-amplified or is it the ...
0
votes
0answers
23 views
What is the purpose of descending auditory signals from the brain?
What might the purpose be of the brain having descending auditory signals from the brain? My textbook is very vague about this and I am just curious.
2
votes
1answer
114 views
What causes sodium channels to open?
What triggers the opening of sodium channels in a neuronal membrane? Is it acetylcholine that activates sodium channels in the postsynaptic membrane?
Are sodium channels like receptors that have to ...
3
votes
2answers
61 views
Speed of electric signal vs chemical diffusion
I'm currently reading the book, "An Introduction to Nervous Systems" by Ralph J. Greenspan.
On page 20, there is a sentence that confused me. It was, "Electrical signaling has the advantage of being ...
3
votes
1answer
60 views
What differentiates neurons in different parts of the brain?
For example: what makes a neuron in the hippocampus of the brain different from a neuron in, say, the amygdala, or the frontal lobe, or anywhere else in the brain? Do neurons in different parts of the ...
2
votes
1answer
61 views
Does loss of dopaminergic neurons totally eliminate voluntary muscular control?
Breathing is a function that is not only autonomic, but can also be temporarily overridden and placed under voluntary control. In fact, you are now breathing manually. Now, suppose that someone has ...
2
votes
2answers
257 views
How do organophosphates actually work?
The common explanation as to what the primary mechanism of action for organophosphates (and carbamates) is is the inhibition of the enzyme acetylcholinesterase and resulting buildup of acetylcholine ...
1
vote
0answers
43 views
What substances can selectively destroy certain cells?
Recently, I've watched a documentary about how, in the 1980s, people were buying and using drugs from the streets and then becoming paralyzed a few days afterwards. The drugs that they were using were ...
5
votes
0answers
43 views
What phosphorylates tau protein & and what causes tau to be phosphorylated?
I want to know what phosphorylates tau protein and its 6 isoforms.
I know kinases cause phosphorylation events, and in tau it can be phosphorylated in a healthy neuron in the trans conformation, but ...
1
vote
1answer
33 views
Can motor neurons in the brain stem start movements?
Supposedly (consciouss) movement is started in the cerebral cortex. But some time ago I've read a research which stated it might be possible some movements (not specified which ones, probably mean ...
1
vote
0answers
52 views
Do non-human primates have mental disorders like humans?
I was at the zoo today and watched a gorilla pick at a scab on its finger, compulsively, until it started bleeding. Is this OCD or is it just a nervous thing that non-human primates do at the zoo? Do ...
0
votes
0answers
32 views
Are there toxins that cause heart attack and/or stroke in multiple individuals in short time frames?
Are there any known environmental factors that would cause more than one person to have a heart attack or stroke within a short period of time (e.g. 2-3 months) of one another? I'm particularly ...
2
votes
1answer
150 views
Can cerebrospinal fluid pass through the pia mater or ependymal cells of the ventricles?
During a lecture, a professor commented that the cerebrospinal fluid and interstitial fluid of the brain parenchyma have similar composition because they can exchange with one another. This struck me ...
1
vote
1answer
36 views
Can nervous disorders be cured? Will enough research be the answer? [closed]
I have searched every nook of the internet and I couldn't find a clear and to-the-point answer. Well my story is that I am a young BSc student who wants to do research on neurological conditions ...
0
votes
1answer
36 views
Neurons and nerves [duplicate]
What is a nerve compared to a neuron? Is it a collection of axons alone or does it include cell body too? I'm pretty confused of what actually the "nerve" is composed of. I had imagined that the nerve ...
-1
votes
2answers
95 views
Why biologic systems tends to become more complex?
From elements, chemical compounds, cells, multicellular organisms, society evolves and with each step possibilities increase and things get complex. We are builing structures like ribosome builds ...
0
votes
1answer
278 views
Can upper motor neuron lesions cause hypotonia?
I have been taught that hypotonia is always caused by lower motor neuron lesions while hypertonia is by upper motor neuron lesions. However, I recently learned of an entity called central hypotonia, ...
0
votes
1answer
640 views
Rod and cone photoreceptors are neurons?
i mean the photoreceptors have axon and dendrite and body cell or it is not neuron
any more . can we say outer segment of photoreceptor cell is dendrite ? of course these have body cells but i am ...
6
votes
1answer
253 views
Why Is Gray Matter Gray?
When I researched I found different reason for this, the popular
ones are
1) white matter is mylinated .this reason was given in reference books and this website
while others say
2)cell body ...
3
votes
1answer
45 views
Flow diversion for cerebral aneurysms or stabilizing the hemodynamics?
I'm doing research of flow diverter for cerebral aneurysms applications and I'm wondering the reason behind stent placement underneath of cerebral aneurysms is to divert the flow or stabilize the ...
3
votes
0answers
62 views
What is the signal that indicates which neurons Schwann cells should myelinate versus which should remain unmyelinated?
Schwann cells are neuroglial cells that produce myelin in the peripheral nervous system.
However, not all axons are myelinated - some will remain unmyelinated.
There must be some signal that ...
1
vote
0answers
86 views
Why Cerebrospinal fluid is not heated for VDRL?
For performing VDRL of serum , we heat serum to inactivate complement proteins which may otherwise interfere , but why don't we do same for CSF even though it too has complement proteins in it?
Is it ...
3
votes
1answer
78 views
Why there is no neurovascular drug-eluting stent?
I'm researching on neurovascular stents and I'm wondering why there is not much about drug-eluting neurovascular flow diverters in the literature? I read in an article that it's because of complex ...
5
votes
2answers
642 views
Neuron connectivity- how are they connected physically
If Neurons are only connected through synapse and there is no physical connection, how are they just suspended in brain layers?
1
vote
1answer
76 views
Are there humans which the brain sends signals to the limbs faster than the average?
I have done some researches on the time taken by the brain to send signals, but I didn't find whether that time is the same amongst all humans or there are some differences, and I have based my ...
1
vote
1answer
44 views
Is it possible to directly uploaded controlled imagery into a person's conscience?
I was wondering, is it possible to use electrical charges and/or EM waves to induce imagery directly into a person's mind?
I got this idea because since almost everybody dreams, and dreams are ...
1
vote
0answers
40 views
is it possible to use electroshock to temporary stop gross motor functions directly on the neural pathway?
Is it possible to modify that procedure and use it to send a small electroshock on the specific neural pathway and temporarily stop that gross motor function?
When the microphone detects unwanted ...
1
vote
1answer
108 views
How do our eyes see an inverted image? [duplicate]
How exactly do our eyes see an inverted image of what we are looking at?
Does it have something to do with the shape of our lens (i.e. convex)?
3
votes
1answer
155 views
What parts of the visual system could be responsible for a fixed, monocular scotoma?
Light enters the cornea, crosses the lens, hits the retina. Electric sinal travels from retina through the optic nerve, reaches the chiasma, crosses and makes its way to the visual cortex.
My ...
-2
votes
1answer
34 views
Can we send signals to nerve?
I want to know two things.
Can we send a signal to a nerve using external source like electricity?
Can we differentiate signals sent from receptors like pain receptors, pressure receptors etc.
2
votes
1answer
80 views
What are ECT parameters?
ECT or shock treatment is used to treat psychological disorders. How much voltage, current and duration is used for this? Wikipedia mentions a treatment of 0.8 Ampere for 5 seconds.
6
votes
1answer
96 views
Are there any known rules that neurons always follow while transmitting/receiving signals?
I'm new to neurobiology so I don't know much about it. However, I have worked on artificial neural networks. Man-made AI networks all follow a handful of simple rules.
I was wondering if biological ...
2
votes
2answers
12k views
difference between neurotransmitters and hormones
I have been reading a lot about neurotransmitters and hormones but what's the difference between them both or are they the same? It's been confusing for a while now. Also, why do some ...
2
votes
0answers
51 views
What happens to the brain during meditation?
I've read several experiments on the internet according to which it is possible to reach a psychedelic state without taking any psychedelic drugs like DMT, LSD and other tryptamine derivatives.
It ...
3
votes
1answer
79 views
Confusion about the construction of the rat's mental map
I'm reading the article "A Topological Paradigm for Hippocampal Spatial Map Formation Using Persistent Homology" by Y. Dabaghian, F. MĆ©moli, L. Frank, G. Carlsson
I try to understand the following ...
3
votes
0answers
48 views
Question About the Physiology of Seizures
Absence seizures usually occur in children between ages 4 to 14 (Hopkins Hospital). Spontaneous remission occurs in 65ā70% of patients during adolescence (Medicine Central).
My question is what ...
1
vote
1answer
75 views
Why aren't the brains of most advanced life forms in the middle of their bodies? [closed]
This question is designed to be the successor to Why don't most animals have "heads" in the middle of their bodies?
The previous question was flawed as it fails to accurately define ...
8
votes
1answer
355 views
Why do neurons loose the potential to regenerate and reproduce in adult animals?
I have read in several books that neurons in the central nervous system loose the power to regenerate after some developmental stage but why do they? Can we artificially induce regeneration?
1
vote
1answer
40 views
Implanted neural recording system vs Electroencephalography
Can someone help me to understand why in nowadays the scientists develop implanted neural recording system to measure and collect neural signals? Why the use of the electroencephalogram is not ...
3
votes
0answers
298 views
How long can one go with necrosis?
In general, when a limb dies, how long does it take before it falls off? Can you go years with a black and useless limb, or does it just.. fall off right away?
1
vote
1answer
151 views
If action potential is “all or nothing” then how are finely tuned signals sent from one neuron to another?
If the action potential is an "all or nothing" phenomenon, then how is one type of neurotransmitter secreted rather than another? Let's say, for example, if a neuron received an excitatory post ...
3
votes
1answer
103 views
Names for effects of sleep deprivation on the brain & body
When staying awake for a long period (3 or 4 days), some weird phenomena can occur. In my experience, it was always triggered by thinking too deeply and has in other occasions too.
Do these things ...
5
votes
1answer
535 views
What is synaptic bias?
In non linear model of a neuron there was a mention about bias (Bā) which was the summation of the synaptic weights.
I want to understand what synaptic bias is and their application/use in neuronal ...
