Neuron Definition and 39 Threads

I'm not sure where this belongs, I'm guessing biomedical, but I'm interested from a physics perspective. Do neurons generate an electromagnetic field? In other words, all the neural activity in the brain, does it generate electromagnetic fields? If so, what are the details of these fields? I...

I'm looking for a general analytical solution to a particular ODE that comes up in neuroscience a lot. My feeling is that such a solution can't be obtained, otherwise someone would have presented it by now, but I don't have a good understanding of why it is so hard to solve. The equations as...

Does anyone know if it is possible to develop a fully analytical solution for a leaky integrate and fire neuron driven by arbitrary time-varying current? Here's what I have so far (setting as many possible constants to 0 and 1): The equations: ## \dot{V} = - V + I(t) ## and if ##V(t) = 1##...

I am reading https://www.ncbi.nlm.nih.gov/books/NBK21668/#_A6137_. It mentions that AP propagates along the length of the neuron due to the passive spread of depolarization, but it is only for small (thin, I presume?) myelinated neurons and large unmyelinated ones. My question is how do APs...

In my quest to build better AI, I've been researching a lot on how the human brain works. I understand the overall structure of the neuron and how it communicates with other neurons. The only thing I don't understand is how a neuron decides when to send out a signal/response to other neurons...

From post: https://www.physicsforums.com/threads/random-thoughts-part-6.875108/page-180#post-5978198 I can see there is a gray-black stuff, but inside the gray-black stuff is a shiny lit moving stuff that moves in like a frenzy. What is the shiny lit moving stuff that moves across the...

we know the fact that nerve cell can receives, processes, and transmits information through electrical and chemical signals and actually i am an 2nd years electric and automatic engineer so when it come to the field of biology i am not so good so if you try to make a special thread that can...

Hi, Here is a little video I made about a dorsal root nerve fascicle. Original image from Professor Ennio Pannese https://www.amazon.com/dp/B00USZ5O4E/?tag=pfamazon01-20

As I understand, there are peripheral neurons that stretch for up to a meter or more from the spine to wherever the muscle is. I was curious, does this apply to all the neurons that for example, move my right hand? Are all the neurons in my fingers individually that long, starting at the spine...

Nowadays we hear a lot about AI deep learning artificial neural networks. People speak about simulations of billions of neurons and even much more synapses. However, as far as I understand it, the artificial neurons used in these simulations are extremely simplified models of real biological...

Hi Friends! We know that nucleus of neurons remains like a closed blueprint!Is there any evolutionary pressure for cells not to multiply? Also in hippocampus they can multiply in only a highly limited number.Why different behaviour in hippocampus? Thanks in advance!

http://www.sciencealert.com/a-giant-neuron-has-been-found-wrapped-around-the-entire-circumference-of-the-brain "For the first time, scientists have detected a giant neuron wrapped around the entire circumference of a mouse's brain, and it's so densely connected across both hemispheres, it could...

I know that SSRIs inhibit the reuptake of serotonin from synapses, and therefore cause the receptors on the postsynaptic neuron to be activated for a longer period of time. Does this have any effect on the signal sent? (for example, does it make it so the signal takes longer to process?, etc)

Hello, is there an official word that describes the connection (or "information exchange") between a receptor (or effector) and the neurons that they touch? I know that between neurons, there is a synaptic connection, and between muscles, that would be kinesthetic connection (I am guessing) but...

Is it possible to 3d print a neuronal structure with a different material than neurons that would work just like a neuron with membrane potential?

Hi I want to know whether DNA inside our brain neuron cells helps us process images of what we see through our eyes.

I am viewing (through https://www.edx.org/course ) an introduction course to computational neuroscience. In the second lecture, the Hodgin-Huxley model is considered. I am going over some of the questions and have encountered a problem with one of them (a picture of the exercise is attached...

Hi Everyone, I am simulating(using HSPICE) HR neuron model using analog computer technique but I am not getting the required response. I am using uA741 model of opamp and MLT04 model of multiplier. I have tested these components individually and they are working fine. I doubt there is something...

From what I understand, neurons at rest are in a state of polarization, with Na+ ions abundant on the outside of the cell and K+ ions abundant on the inside of the cell. During depolarization, sodium ions rush in, creating a highly positive charge on the inside of the cell relatively to the...

I was wondering what carries the current between two nodes of ranvier (under the myelin sheath) in a neuron. Books and sources say that the impulse jumps between nodes, but I have not found one that tells me how! Is it through the membrane, across microtubules, through the cytoplasm, or...

Homework Statement 1. Homework Statement For a neuron with the transfer function given below deterimne the weight updates after presentation of the two constructive training samples: xA = [2,-1] and xB = [-1,1], where the former one belongs to class A (desired output is 1), the latter to...

what will be function of TERT,and shelterin complex protein in Neuron regeneration,is their any variant in telomere and telomerase between normal neuron and reprogramm neurons?

I have some very simple questions. 1. What are the real life applications of the biological neuron models (for example Hodgkin-Huxely model)? 2. Is their any online database from where I can get the original recordings data of a neuron? 3. or is there any way that I can...

Hello! I was reading a journal article on modeling the interaction between different neural networks and I am confused about the follwoing method (cited below). It is describing the spike rate output of a neuron based on oscillating firing rates of excitatory (E) and inhibitory (I) inputs...

Hi all, I'm trying to understand the electrical model of a neuron, and I have 2 questions. I'm a little confused about the time constant in this electrical model of neuron recording: The time constant shown is tau = C*(Rm*Rs)/(Rm+Rs), which implies that the resistors are in parallel...

Hi. I am learning how neuron transmit current. I am wondering after firing sodium ions are rich and potassium ions are poor in neuron cell. How ion concentrations come back to the original states before firing? Thanks for your help in advance.

I am thinking if electromagnetic radiation can induce an electrical current in the neuron similar to the way antenna works. Since the antenna receive radio wave, which is a type of electromagnetic radiation to generate electricity. Can the neuron also receive electromagnetic radiation and induce...

I did this problem on this British Physics Olympiad paper and it assumed that when a star bigger than the sun collapses under its own gravity to create a neuron star the magnetic flux stays constant. Please explain Thanks

Electricity affect neurons. For example, in 1791 Galvani made the legs of a dead frog twitch by exposing them to a spark, and more recently in history, electric currents through the brain has been used to deliberately induce "therapeutic" epileptic seizures. What I wonder about is the exact...

Models like the Hodgkin-Huxley and Morris-Lecar include a current term: applied current. http://cropsci.illinois.edu/faculty/gca/bioengin/Top/Lit/GENESIS_book/iBoGpdf/chapt4.pdf From what I understand, experimentally, this is the injected current, applied by the experimenter. But what is it...

Does anyone know what areas of the brain have a denser amount of synapse? Are there more connections on the outside area than the inner areas, or is it uniform for the most part?

I'm writing a scifi story about a human undergoing rapid evolution due to his being repeatedly "connected" to an alien biological machine,that would be controlling the evolution through some kind of program. one of the changes would be a "master" cell that was able to regulate clusters of...

Homework Statement Which of the following is NOT important in determining a neurons membrane potential: The function of the neuron or the location of the neuron? Homework Equations N/a The Attempt at a Solution The function of a neuron is obviously the integration, summation, and...

Homework Statement During the action potential, Na+ ions move into the cell at a rate of about 2.98×10-7mol/m2/s. How much power must be produced by the active transport system to produce this flow against a +25.2 mV potential difference? Assume that the axon is 11.7cm long and 19.6um in...

I'm looking for information on the different kinds of neurons and their possible interactions. I wish to program a model of sizable amount of neurons connected to each other in the various possible ways. so, can anyone direct me to a good reading material?

I have a problem that I can't figure out, as do most people I guess, so here goes. A neutron star is 1,000 times smaller than the Earth and has 450,000 times the mass of the earth. How many times heavier would you be on the surface of a neutron star?

Removing a brain cell and replacing with a chip must make one of two possible assumptions. The first is that what goes on inside a neuron is pertinent to consciousness. Alternatively, we might assume that what goes on inside a neuron is NOT pertinent to consciousness, that only the outward...

Neutron Stellar Cores... I watched a program in which a astrophysics professor suggested that in theoretical calculations, a Trans-Oppenheimer Neutron Stellar Core's acoustical velocity can exceed vacuum luminous velocity. v_s >= c Oppenheimer Neutron Stellar Density: p_n = \frac{3...

In my continuing research on seizures I came cross an article that goes into great technical depth. I'm wondering if anyone can read the following and expand and elucidate some of the biological terms. "The cellular neurophysiological correlate of an interictal epileptiform discharge in single...