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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.

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Is there still a convincing argument/evidence that adult neurogenesis does not exist/play an essential role in NON-Human Primates?

Adult neurogenesis in human-being is a debated topic, and will probably take several years to get resolved. I am under impression that it is relatively easier to settle the debate on non-human ...
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70 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 ...
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1answer
21 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, ...
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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 ...
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Why Is Gray Matter Gray?

There are different people giving different reason for this popular one 1) white matter is mylinated .this reason was given in reference and few website like this while others say 2)cell body ...
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1answer
23 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 ...
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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 ...
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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 ...
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1answer
58 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 ...
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2answers
476 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?
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1answer
65 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 ...
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1answer
41 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 ...
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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 ...
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1answer
61 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)?
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1answer
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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 ...
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1answer
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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.
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Are saturated fats beneficals for the brain's functions?

Are saturated fats beneficals for the brain's functions? if so, which kind of saturated fats? I found this information about medium-chain triglycerides (found in coconut oil), 1)it is smaller than ...
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1answer
47 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.
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28 views

Actual Time of nerve impulse travel

How much time the nerve impulse takes in traveling from sensory receptors upto the brain? I am not asking the speed of travel, but within how much seconds the nerve impulse reaches once it is onset by ...
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1answer
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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 ...
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2answers
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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 ...
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0answers
37 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 ...
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1answer
67 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. Mémoli, L. Frank, G. Carlsson I try to understand the following ...
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Question About the Physiology of Seizures

Absence seizures usually occur in children between ages 4 to 14 (Hopkins Hospital). Spontaneous remission occurs in 65–70% of patients during adolescence (Medicine Central). My question is what ...
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1answer
66 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 ...
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1answer
166 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?
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1answer
38 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 ...
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0answers
219 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?
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1answer
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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 ...
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1answer
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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 ...
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1answer
341 views

What is synaptic bias?

In non linear model of a neuron there was a mention about bias (Bₖ) which was the summation of the synaptic weights. I want to understand what synaptic bias is and their application/use in neuronal ...
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1answer
47 views

Neurons competing for survival

I was reading in a book that in the process of neurogenesis - when new neurons are born - neurons compete for survival. Or in other words they have to make themselves useful to the brain otherwise ...
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2answers
422 views

Is it possible to temporarily paralyze someone through the use of electric signals or focused ultrasound?

I've been reading about how it is possible to send signals to the brain using focused ultrasound or electrical impulses. It is possible to make someone see a certain shape or color by stimulating ...
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1answer
1k views

Why is it that I can understand speech through one ear better than the other ear?

First, I do a lot of music so I'm used to pick up details in sound and I have had hearing tests showing that my ears are quite well balanced, for my age, without any dead spots. When I am in a social ...
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Would methamphetamine heal wounds, infections, and diseases?

Alright, so this sounds crazy but based on these research findings it is safe to assume that meth would allow wounds and diseases to heal faster by interleukin 6 . On the otherhand, using meth during ...
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Does the Spinoreticular Tract end in Brainstem?

According to this book on Springer spinoreticular tract is : As the name implies, the tract originates in the spinal cord and terminates in the reticular formation (RF) in the brainstem. While most ...
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1answer
116 views

Why don't neurons die during a stent procedure in the brain?

Stents are used to provide scaffolding to the blood vessels. When they are used in arteries or arterioles in brain, won't neurons die because of lack of oxygen during procedure?
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Why do nerve fibres rotate?

Background: Lemniscus (Latin lēmniscus, ribbon) is a strap of second order nerve fibres which twist as they ascend to the brainstem. Why do these these nerve fibres rotate? What could be the ...
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1answer
1k views

What is two photon calcium imaging?

I have encountered the term "two photon calcium imaging" in a few papers. I have tried to look in the internet but can't understand what this technique actually is. I will be very happy for ...
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47 views

What is methamphetamine's transport carrier across the BBB?

Which carrier protein allows methamphetamine to cross the blood brain barrier? I would assume it's SLC22 and possibly SCAMP1
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Is 7-nitroindazole neuroprotective against meth because it oxidizes peroxynitrate?

So 7-nitroindazole (7-NI) prevents methamphetamine (METH) induced neurotoxicity AND completely prevents meth induced dopamine depletion, but doesn't prevent meth induced hyperthermia. Strangely, a ...
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1answer
2k views

Why can't dopamine cross the blood brain barrier but l-dopa can?

Levodopa can cross the BBB and is less lipid soluble then dopamine, so dopamine should be able to cross the BBB more easily then l-dopa, but for some reason dopamine cant cross the BBB. Both dl-...
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1answer
813 views

Why a brain's hemisphere controls the opposite side of the body? [duplicate]

As a physics student with very little understanding of biology, in a course about physics foundations diagnostic techniques I have come up with this question. I don't even know if it does make sense ...
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0answers
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What is the current consensus on the Loveheim Cube of Emotion [closed]

I recently encountered the Lovheim Cube of Emotion. I was wondering what level of supporting research there is to go with it and whether or not there is a concensus at this stage. If I'm perfectly ...
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2answers
585 views

Why does our face get red during anger?

My attempt: This site says that it is due to flight or fight mechanism, which results in more amount of blood being passed to face causing red face. But isn't it wasteful for our body to send more ...
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1answer
586 views

Small vs Large neurons

What is the criteria for classifying neurons as small and large? Is this classification based on gross size or the length of axon? Do they have any physiological difference? For instance it is said ...
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0answers
51 views

Why do palpitations happen when someone is nearing something rewarding? [closed]

When you are nearing something rewarding (IE: winning a prize, or winning a game), why do you experience tachycardia? For example, if someone entered a raffle with the number 9284938, and the ...
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1answer
772 views

How does methamphetamine (meth) damage neurons?

Meth is considered to be neurotoxic by forming reactive oxygen species and oxidizing the neurons. But unlike dopamine, which, by the way, is neurotoxic due to ROS induced dopaminergic stress, meth ...
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1answer
214 views

How spinal cord play its roles in human beings sex? [closed]

I know most people can't enjoy sex if their spinal cord injured. How spinal cord play its roles in human beings sex?
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0answers
88 views

Why do myelinated axons conduct impulses faster? [duplicate]

How does the myelination help in better conduction? I would prefer answers that are not too technical please.