The study of the structure and function of the nervous system and its components.

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How small does a nanobot have to be to “swim through the brain” and access any neuron it wants to?

I read on this question What is in the space between neurons in a brain? that there is actually not much empty space in a brain. But my question is slightly different. Is there a visual demonstration ...
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28 views

Confusion over role of current/potential in Nervous system?

I am taking a course on the nervous system and I am do not have any physics background. Therefore, I would like to know, what are we precisely talking about when we talk about current in the nervous ...
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1answer
87 views

Do ants feel pain?

I have watched video on youtube where guy pours molten aluminium into fire ant colony to make casing. In the comments below there's huge discussion on is that a right thing to do. I am on the side ...
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30 views

Criteria for electrophysiological threshold

As opposed to action potential thresholds (which are yes/no events), electrophysiological thresholds of compound action potentials are arbitrary. Mostly a certain noise level is picked and when the ...
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3answers
266 views

Can human brain memory be removed by EMP?

The human brain is the most complicated human organ so it is hard to examine it completely but based on what we know do you think (or do you know from some source) if a human memory can be removed by ...
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2answers
59 views

Converting fmri data to association matrix

I am currently working on a new tool for the analysis of (large) weighted networks. Association matrices (correlation matrices) as obtained from fMRI data are perfect examples of the kind of data I am ...
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1answer
97 views

A subtle test for color-blindness [closed]

Is there a test method of proving a person being color-blind, without letting the test subject know, that he/she is being tested? E.g. showing the person cards with colored dots like depicted here is ...
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150 views

Effect of pupil responses on the electroretinogram

The electroretinogram (ERG) is generally considered to reflect the retinal processing of a light stimulus, typically a photoreceptor response followed by secondary neuronal activity. I am wondering ...
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1answer
26 views

What controls gut motility?

I have two different papers. One claims that gut motility is reduced by stimulation of the Opioid κ and δ receptors. The receptors are activated by Morphine and certain derivatives, specifically ...
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23 views

Gastroenteritis virus causing mutation of the Enterochromaffin cells

I am working on the solution to a worldwide problem: IBS or chronic diarrhea following a viral gastroenteritis infection. I think I have an answer. The only missing piece to the puzzle I found in a ...
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2answers
84 views

Book recommended for neurobiology

I am looking for a good explanatory book concerning Neurobiology. I am interested on how the brain works but prior to this I believe that I have to start learning things about the biology of neurons. ...
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2answers
70 views

Is the Hypothalamus part of the Central Nervous System or Endocrine System

Sorry for a certainly naive question. Some references (for example https://faculty.washington.edu/chudler/nsdivide.html) seem to to indicate that the hypothalamus is part of the Central Nervous ...
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216 views

What is the mechanism of reflex arcs?

When a reflex arc occurs the signal from the receptor passes straight to the motor neuron instead of being passed onto the brain. This is a rather simplistic explanation, I was hoping to make it more ...
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24 views

Is the brain functionally symmetrical?

I understand that each half of the human brain handles different parts of our thinking. Left brain, right brain, that whole topic. But in pictures, the brain is always depicted as having symmetrical ...
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1answer
23 views

How isolated are different areas of the brain?

I'm interested in understanding how isolated different parts of the brain are from each-other. I'm trying to understand the way that different sections of the brain work together. More specifically, ...
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1answer
134 views

How does the brain avoid feedback loops?

The article Ants Swarm Like Brains Think really helped me to understand the way that neurons which are pretty dumb on their own (like ants) can work together to create a pretty genius system (a brain ...
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3answers
79 views

Can connections between neurons be weakened?

Connections between neurons are said (by Wikipedia) to be strengthened as part of learning - can they also be weakened (below the original level)? I understand the concept of the connections ...
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42 views

What is the advantage to neurons being asymmetrical?

Does having a central axon and dendrites result in any advantage compared to if the neuron was symmetrical?
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80 views

Mechanisms of extracellular stimulation of neurons

When stimulating a group of neurons with an electrode, let's say we put it in a region that contains axons, what is the mechanism by which the axons are stimulated? I've been told electrodes ...
2
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1answer
274 views

Neurons with thousands of connections: where are the extra connections coming from?

If every neuron has only one Axon but can can have thousands of (or let's say, even just ten) incoming Axon connections via its dendrites, where are the extra connections coming from? It seems to ...
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4answers
105 views

Are neural connections one-way?

I'm trying to think about how two neurons communicate, typically shown in pictures as an electric pulse traveling along a long, thin connective tissue. Is this depiction somewhat accurate, and if so, ...
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60 views

Does the Jungian notion of collective unconsciousness have any legitimacy in the light of modern neurobiology and epigenetics?

Carl Jung has long ago proposed a rather controversial notion of collective unconsciousness [1, 2, 3], a form of the unconscious (that part of the mind containing memories and impulses of which ...
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1answer
86 views

Can the sensory neuron network and the motor neuron network be considered separate networks?

I am reading up on the nervous system using wikipedia and trying to interpret one infographic on this page: I've always thought of the human nervous system as a singular network of neurons. This ...
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1answer
2k views

Whats the difference between voltage gated and ligand gated neurons? [closed]

How are they similar and how are they different?
14
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96 views

What is the mechanism responsible for the periodicity of hiccups?

Hiccups (singultus) are caused by involuntary spasm of the intercostal muscles and diaphragm, producing a sudden inspiration with associated glottic closure. It seems the neurobiology of the reflex ...
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2k views

Why can't neurons undergo cell division?

Many cells in the human body can divide and reproduce, making healing possible. Neurons, however, cannot reproduce, which makes diseases affecting the brain particularly crippling. Why can't neurons ...
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321 views

How long does a signal from the brain take to reach the limbs?

If the brain sends a signal to move what's the time it takes the signal to travel via neurons to motor neurons in hands, arms and legs? How fast do those signals travel?
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1answer
35 views

What is the mechanism responsible for the 'delay' in delayed rectifier potassium channels?

I've been trying to find a comprehensive explanation concerning the nature of the 'delay' in neurons' delayed rectifier potassium channels. As it's written in my intro to neuroscience textbook, these ...
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79 views

Can you disconnect sensation from the brain without destroying muscle functions?

I want to know if it would be possible for a surgeon to "shut off" a person's senses without causing paralysis of any kind. The person would have to maintain their ability to speak and move, but not ...
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48 views

Biology Experiment Data (Hodgkin-Huxley)

I'm doing research into the Hodgkin-Huxley Model from an electronics/mathematics perspective and I'm looking to find actual numerical results from experiments on squid axons. I want to compare the ...
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1answer
78 views

Does Spinning dancer has anything to do with your eyesight

I came across the spinning dancer as part of the brain test to determine left brain vs right brain dominance. I saw the dancer is turning clockwise. The other people around me saw it turning ...
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1answer
3k views

What do you see when your eyes are closed?

If you are in pitch black and you close your eyes, you sometimes can see strange shapes of various colors. A lot of the time these shapes and colors change as you observe them. This phenomenon still ...
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1answer
47 views

How can I determine the purity of cells isolated from rat brains if I cannot use FACS, Immunohistochemistry or SEM anaysis?

Please help. I know how to isolate the different cells (astrocytes, other glial cells, neurons and synaptosomes) from brain tissue using a Ficoll-based separation but how do I determine the purity of ...
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2answers
56 views

Is there any research on how accurately people can follow a beat?

I'm currently helping develop a rhythm game, and as part of the scoring system, I'd like to make scores and ranks based more on accurate pattern recognition rather than hitting notes very exactly on ...
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66 views

What keeps resting potential of neurons constant at -70mV?

I know the sodium-potassium pump pumps out 3 Na+ ions and pumps in 2 K+ ions per reaction so the negative charge in the axon increases. However, once the voltage (difference of charge inside and ...
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1answer
140 views

What is the difference between clinical and non-clinical depression, and is there a term for different severity of the bipolar disorder?

I was looking for a term which describes a bipolar disorder of lesser severity. I know from experience from someone I know well, what a very severe case of the bipolar disorder looks like, when an ...
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147 views

Can a single axon propagate multiple simultaneous action potentials?

I have not been able to locate any research that indicates whether a single axon of a neuron or nerve cell can conduct multiple simultaneous (i.e. spatially separate) action potentials. I am aware ...
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1answer
40 views

What is meant by drug tolerance?

What is meant by drug tolerance? This question is in my biology textbook for IGCSE and I have no idea what drug tolerance is. It would be very helpful if someone could clarify. Thank you.
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30 views

Is it possible to convert nerve signals or electrical pulses into a readable format? [duplicate]

Can we have the technology to recreate the informations (like images, sounds etc.)[as in the form of signals in our mind] from human mind to human understandable format? In short, can we read human ...
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1answer
43 views

Is severe but short-term pain worse than moderate but prolonged pain for the body?

I'm wondering about the effects of different durations and intensities of pain on the body. So the two can be compared, let's say that the cause of pain is the same in both cases, but in one the ...
2
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1answer
48 views

What can myelination tell you about the evolution of sensory receptors?

I am reading Avi Chaudhuri's Fundamentals of Sensory Perception and wondering if the information given about the somatosensory system could tell us anything about the way it evolved. It seems (at ...
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1answer
79 views

Can the negative afterimage appear only if there is light or is it possible in darkness?

Reading the following paragraph: After staring at the red and blue shamrock, you saw a green and yellow afterimage. Opponent-process theory proposes that as you stared at the red and blue ...
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1answer
58 views

Is an Eidetic Memory (or other unusual forms of memory) less susceptible to anterograde amnesia?

I'm a physicist, so as a fellow scientist I want to apologize because this question will be entirely based on anecdotal inferences and I am well aware how irritating that can be. I have an eidetic ...
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45 views

What could cause no pain but sense of touch?

What could cause a mammal to have and respond to a sense of touch with only isolated numbness but not feel pain?
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101 views

What is the biological principle of this “holotropic breathwork” technique?

Holotropic breathwork is a non-drug technique developed by Stanislav Grof used in psychotherapy. The therapy as a whole is usually called holotropic breathwork (at least by Grof himself) and will most ...
4
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1answer
60 views

How to measure trajectory regularity?

I have two animal running trajectories. A regular one with repeated back and forth running between point A and B, like the one on top in the figure. The other one is very irregular, animal paused and ...
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1answer
89 views

What is the core mechanism behind neuroplasticity?

Specifically I am looking at reopening of the critical period of plasticity. Modern neuroscience has started to unlock the secret of neuroplasticity. A common experimental setup is with mice. They ...
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2answers
226 views

Where do the 31 spinal nerves start/meet?

Which part of the brain is the first place (from top to bottom) where all 31 pairs of spinal nerves (on each side) meet? Or if they all start at one place - where is that? Nominally, the beginning of ...
5
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1answer
62 views

Can neurotransmitter depletion cause short-term drug tolerance?

I'm curious to know if neurotransmitter degradation factors into drug tolerance and neural conduction and, if so, to what extent. As I recall from textbooks I read as an undergrad, one mechanism of ...
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1answer
991 views

Dark veil when getting up too fast

I was asking myself this weird question. When you get up or stand up too fast, sometimes, you see something like a dark veil, and you aren't able to see anything distinctly for 2 or 3 seconds, then ...