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Questions tagged [neurophysiology]

The study of the physiology of the nervous system, with emphasis on transcellular communication, and cellular and molecular processes involved in neural communication.

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Does focusing on a certain part of the body increase electrical activity in that region?

I am batting around ideas for master's thesis topics and was wondering whether or not just focusing on an area of the body would cause of boost of neuronic activity? Not sure whether this would fall ...
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Thoughts Transmission [closed]

I've read that professor Leond Vaslif (I'm not sure if that's the right spelling of his name), the physiology department head in Leningrad State University in 1961, was the supervisor of a study on ...
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When the present state of knowledge concerning central noradrenergic transmission was established?

Some time ago I began to search for descriptions of the mechanisms responsible for the regulation of noradrenergic transmission in the central nervous system of man and to my great surprise the most ...
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Why do neurons have long axons but short dendrites?

Cian O'Donnell, a British neuroscientist, originally asked this question on Twitter: https://twitter.com/cian_neuro/status/1075432086692089857. I am not a biophysicist by training but I wonder whether ...
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Can light function as a neurotransmitter?

Any animal with an eye has photoreceptors, which are essentially light-sensitive neurons. Green algae have channelrhodopsin, which are ion channels that open and close in response to light. Clearly, ...
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Action potential frequency presynaptic neuron comared with in post-synaptic neuron/ muscle cells

I am a physicist interested in knowing how the action potential frequency in a presynaptic neuron compares with that in a) a post-synaptic neuron and b) membrane depolarisation of muslce cells, ...
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In Study from Blue Brain they say position of synapses doesn't change even if they modify neurons, only when they change shape of neuron it changes?

https://medicalxpress.com/news/2012-09-blue-brain-accurately-neurons.html We could vary density, position, orientation, and none of that changed the distribution of positions of the synapses..... ...
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What is the maximum electric potential that can occur in the human body?

Neurons can generate a voltage, if there is an action potential. Also, membranes where an ion concentration gradient is present, generate some membrane potential. What I wish to know is, which ...
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Can turkeys run around when their head is cut off like chickens do?

Chickens may run around after their head is cut off if the head is severed near the base of the skull leaving the brain stem intact and missing the jugular vein. This usually only lasts for a few ...
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To what extent does the distribution of nerual transmiters in the brain vary human to human?

Suppose $x$ is a position in the brain, and $n_i(x)$ is the density of neuro recepter $i$ around that point. Any given human will have some distribution of neruo recepters $n_i(x)$ through out there ...
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What happens in a nerve cell when a thought is generated?

I know basic nerve physiology of impulse conduction and transmission, but I don't know what actually happens in a nerve cell when a thought is generated. When a external stimulus (like tactile ...
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Why is peripheral vision not bleached by daylight?

In daylight, rods are known to be bleached: we have to wait some time after going into darkness before scotopic vision becomes effective. But, as I understand, peripheral vision is also mostly due to ...
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Why does resting potential not become continually more negative?

(Firstly, I know this is similar to other questions, but I have read those answers and they do not really cover this topic). My understanding of resting potential: action potential is not being ...
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Why doesn't oligodendrocyte produce neurilemma

I was searching literature related to neurilemma and oligodendrocyte and came across these lines from WP (Neurilemma) Oligodendrocytes do not have neurilemma because excess cytoplasm is directed ...
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Once neurotransmitters bind to its receptors, how does the post synaptic neuron “know” when to start a new action potential?

My textbook seems to gloss over this subject. Once the post-synaptic receptors are activated, do they cause particular ion channels to open, letting positive charge into the cell and inching the ...
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What happens in a brain of a person suffering with apathy?

According to this article Apathy is a profound loss of motivation not attributed to decreased level of consciousness, cognitive impairment, or emotional distress. Apathy refers to a set of ...
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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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How to determine if the amount of manganese chloride will change neural resting potential

If I am treating an organism in MnCl2 dissolved in water, how do I determine if the amount of Cl (in MnCl2) will change the neural resting potential Oor if it will influence motoneurons?
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loops in neuron synapses

If we see at the connectome of c.elegans, it is easy to find "loops", in the simplest case, a neuron that synapses to another and this one backward to the first. By example, neuron RIAR has 13 ...
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What is the mechanism behind the F-Wave?

Can someone explain the actual mechanism behind the F-wave? Is it really different from a H-reflex response or does it just have another name for historical reasons? The H-reflex (Hoffmann's reflex) ...
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1answer
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Volley theory and sound amplitude/power

Assume a pure tone (single frequency) is listen, lets say 2 kHz. If I understand correctly the temporal theory (aka timing theory), in a cochlea neuron the action potentials create a signal that will ...
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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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What is the signal conversion from hair cells to cochlear nerve cells?

If I understood correctly, inner hair cells generates a graded potential (receptor potential), this potential maps the stereocilia deflection. On the other hand, the cochlear nerve cells transmit ...
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Can a brain dead person recover?

Many times I have heard someone having to pull the plug because the patient was declared brain dead before the body healed fully? Why do they pull the plug without first waiting till the body/brain ...
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Is there a biological determinant for right- or left-handedness?

When I was very young, I was sent by parents to examination where I was told both my hands are dominant in the same way. My parents preferred to make my life easier and chose to focus on my right hand ...
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How do you check how many cones you have in your eye?

Following my previous question: What color does the other cone in Tetrachromacy correspond to? People with normal color vision posses 3 cones in their eye. But there are some rare cases when people ...
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Does only one interneuron or upper neuron innervate all lower motor neurons in a muscle?

After reading Kandel I am unclear on this point. I understand that the cell bodies of somatic lower motor neurons cluster in motor nuclei (motor pools) in the ventral horn of gray matter in the spinal ...
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How does a neuron know to which one of the next neurons to pass the signal

Looking into how neural networks are build in the brain, here are a couple of facts followed by some questions: The neuron receives the signal through its dendrites and passes it to the terminal at ...
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Specific Neurons that Require Glucose

I've been doing a bit of armchair biology lately, and have been interested in the metabolic flexibility of neurons. My understanding is that, besides glucose, many neurons can metabolize lactic acid ...
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1answer
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How is ATP converted to adenosine?

I am familiar with adenosine diphosphate (ADP) and adenosine triphosphate (ATP), how one relates to the other, and how each is formed in cellular respiration and photosynthesis, but I am confused as ...
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1answer
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The information carried by nerve signals

Action potentials carry nerve signals in individual neurons and somehow encode information. My question is if it is possible to read that information carried by the nerve signal and feed it into a ...
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Scaling of Ca2+/biochemical signals with dendritic spine size?

I am looking for references that discuss the scaling of biochemical signals in dendritic spines with spine size/synaptic strength. A recent paper (Walker et al. 2017) reports attenuation of NMDA ...
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229 views

What is the purpose of the viscous gel in the Pacinian corpuscle?

I have read that 'when the stimulus (in this case pressure) is constantly applied, the gel repositions itself to prevent the formation of an action potential'. I don't really understand what this ...
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Why do we feel numbness and an electric sensation in our legs after standing for too long?

We have all felt that numbness while standing immobile for a while.It gets difficult to walk.It can also happen if we are just putting some pressure on our legs Why does this happen? I'd like to ...
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What repairs faster when injured: white matter or grey matter?

This was the exact wording of a test question given by my biology teacher and she said that white matter would repair faster, because there is a myelin sheath to protect the cells. Do you agree with ...
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What color does the other cone in Tetrachromacy correspond to?

Human with normal vision possesses 3 cones, which correspond to blue (S), green (M) and red (L). What about tetrachromacy, where people have 4 cones in their retinae? What is the fourth cone exactly, ...
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Are there any plants with nervous systems? [duplicate]

I know that plants can send impulses through their "body." However, I was curious if there were any types of plants that had nervous systems? Or something similar? Thank you!
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Pitch perception - why is the missing fundamental not directly detected in the cochlea?

I'm learning about pitch perception, and learned about the case of the missing fundamental. In the main image in that wikipedia page, it seems like the bottom graph, with the fundamental frequency ...
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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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Why do some reflex actions involve interneurons, but some don't?

According to what I know, the reflex arc of knee jerk reflex doesn't involve interneuron, but other reflex action (e.g. removing your hand when touching hot things) do involve interneurons. Why is ...
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What are the final concentration of ions intracellularly and extracellularly after equilibrium potential is reached [duplicate]

Background Suppose there is a neuron whose initial intercellular K+ concentration is 400 mM and the extracellular K+ concentration is 20 mM. And the neuronal membrane is permeable only to K+. I have ...
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What is the distribution of the major ions across a neuronal membrane for a human neuron? [closed]

I have searched for the ion distributions across the membrane of human neurons on the internet but almost all the information refers to the giant axon of the squid. Could anyone give me the ion ...
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1answer
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How are presynaptic burst firing signals transmitted post-synaptically?

Neurons can exhibit burst firing and this presynaptic process basically results in a flurry of action potentials being fired in a short time window. I'm, however, wondering how these signals are ...
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1answer
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What photoreceptors are necessary to permit infrared vision?

Humans have red green and blue photoreceptors allowing them to sense colours in the spectrum of about 400-700nm. Certain proteins allow for the extending of wavelength range in the RGB receptors, this ...
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Why does my room suddenly look 'reddish'? My eyes seem to adapt to color

To get the context of this question clear, I would like you to walk through some parts of my house. We'll start with one of my rooms as it appears normally - As evident, this part of my house has a ...
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1answer
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Question about the threshold potential

I am a student of Physiology, and I have ended up a bit confused after what I've read today regarding events during a threshold potential. So, while cells are in their resting membrane potential, the ...
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1answer
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Is olfactory input processed by the thalamus?

Is olfactory input processed by the thalamus? I know olfaction is the only sense that can bypass the thalamus, but are there cases where the input can project to the thalamus?
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Is the masking effect of sound related to action potentials or to mechanical aspects of hearing?

I am an applied mathematics / signal processing engineer who wants to learn more and I have a question that has been bugging me for some time. It is known in audio coding circles that human hearing is ...
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What is the physiological mechanism for getting unconscious after a punch to the head? [duplicate]

It is the everyday life in boxing: One boxer gets a smack in the head, cannot do anything for many seconds and then: Victory of his opponent due to a Knockout! What is the reason for losing ...