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

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What features cause mechano sensory adaptation?

In relation to mechanoreceptors (e.g. pacinian corpuscles), what stops a constant stimulus from producing action potentials? I understand that adaption is used to filter out stimuli that aren't ...
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72 views

Organisms with the most extreme sensory capabilities? (sight, smell, sound) [closed]

Background It is quite mind boggling to imagine what it would be like to be missing sight, sound, touch, smell, taste etc. Question Which organism holds the record for most extreme sensory ...
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51 views

Nocioception (pain perception) in subcutaneous tissue

There seem to be no nocioceptors (pain and temperature sensitive nerve endings) in subcutaneous fat. there are nocioceptors and other receptors in veins running through fat, but these can be avoided. ...
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110 views

How long does Lentivirus take to express in vivo mouse neurons?

Does anyone know how long it takes for a standard Lentivirus vector to express its genes (under a strong promoter such as CAG, CB7, etc.), after injection into the brain of a mouse? By hearsay I ...
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61 views

Does Dorsal Raphe Nuclei firing pattern change in response to voluntary breathing?

I'm reading this paper, which discusses how Serotonin may be involved in motor functions of mammals: 5-HT and motor control: a hypothesis . The paper includes the following diagram of the Dorsal ...
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3answers
215 views

Action Potential Distribution On Synapses

This is a biology+physics question. Since there is no biology section, I am asking here. In brain, when a neuron reaches to threshold value, it fires an action potential. In most graphics, that is ...
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125 views

Molecules and human memory

Has it been demonstrated that the memory of human brain is just connections between neurons, not "long" molecules such as RNA or proteins?
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59 views

What do nerves have to do with feeling nervous?

I was thinking about how when people say: "Nerve cells don't regenerate" (which is, apparently, not true at least for some kinds of nerves) and "You're making me nervous" they might not refer to the ...
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56 views

Are there neuronal firing artifacts produced by head movement?

I'm experimenting with a consumer-grade ElectroEncephaloGram (EEG) sensor and have created the image below using the device. Because the sensor on the device does not use a suction cup, there are a ...
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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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63 views

Is it possible for neurons themselves to manifest cancerous behavior?

From what I understand, one form of cancer is a faulty gene responsible for the programmed death of a cell. Not long ago, popular wisdom used to say neurons don't regenerate. However that is no ...
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1answer
254 views

L1 - L5 layers of the brain

I have read in some papers about the layers L1-L5 of the brain (e.g. in this paper). I could not find a definition of these layers. I have found information about the layers V1-V5 in the visual ...
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52 views

Does sympathetic nervous system acts bilaterally for pupil dilation or other two sided organs?

The question might seem weird. Does sympathetic nervous system acts 'bilaterally' meaning if you shout to a person's left ear a loud noise (e.g. by headphones), will it activate sympathetic system ...
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3answers
84 views

Are there “multi-frequency” signals within a human brain?

I know that neurons can exhibit tonic and phasic firing, and also that a neuron is sometimes called an integrator. This makes me interested to know if there are activities in the brain that depend on ...
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1answer
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
71 views

Alpha wave frequency variance in EEG of single subject over period of a few hours?

I have an Emotiv EPOC (EEG headset: 128 SPS, notch filter @60 Hz, felt saline contacts) I've been playing around with. Over the course of two or three hours using CCA to plot an SNR contour against ...
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557 views

What is 'calcium conductance'?

What is the meaning of calcium conductance in ion channels. I encountered this in the following text: It was established that the µ and δ opioid receptors open potassium channels, which results ...
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1answer
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
86 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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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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52 views

Measurement of glucose concentration in the human brain

If I want to measure the exact glucose concentration in a human brain then how can I proceed to do that? Is there any technique or assay to do that?
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1answer
37 views

Specifics of decussation

Beginner question here: The definition of decussation I see is the crossing through the midline of a bunch of neurons. But I was wondering if there was a little more to it than this, because I'm ...
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1answer
37 views

Nervous System : Organ or Gland Failure

If an organ was to start failing, not total failure, such as the thyroid gland, is it possible that the fault may not lie in the failure of the organ but in the nerve signals coming from the brain?
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37 views

Nervous system : Nerve signals [duplicate]

If the electrical signals from all the various organs throughout the body eventually connect to the nerves in the spinal column traveling up to the brain, how does the brain differentiate the ...
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1answer
48 views

Is there a scientific name for the field of study focusing on the hemispheres of the brain and their control of opposite sides of the body?

I'm assuming this field of study would focus on motor controls, movement, and exercise, but it could also focus on activities which strengthen the corpus callosum or stimulate a specific half of the ...
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74 views

Evolution, self organization and neuroscience

I have rudimentary knowledge of evolution, and biology in general, so bear with me if this question is a bit naive. Let's say we have a particular trait, like highly sensitive peripheral vision. ...
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1answer
162 views

If people with colorblindness lack one type of cone cells, shouldn't they be unable to recognize one particular color?

The 3 types of cone cells in normal humans allow them to view 3 types of colors and any color made from mixing and matching those 3. So, 2 types of cone cells should only allow to view just 2 types ...
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121 views

Is Nerve Growth Factor (NGF) commercially available?

I'm curious if NGF, or Neurotrophins in general is available commercially. Can I order it online? If not, what are the medical/biological reasons. Does it breakdown quickly after synthesis/capture? Is ...
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350 views

How different is an introverts brain different from an extroverts?

How is an introverts brain wired differently than an extroverts? Just to give you an example. On an average, the processing that goes on in an introverts brain is greater than in an extroverts ...
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2answers
110 views

Inverse of dopamine reuptake inhibitor?

The wikipedia article on the dopamine transporter gives examples of some drugs whose effects are mediated by the inhibition of the dopamine transporter, such as cocaine and amphetamines. Are there ...
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1answer
33 views

Could silicon oil block Na+ ion channels in the membrane of an axon and prevent Na+ influx?

Could silicon oil block Na+ ion channels in the membrane of an axon and prevent Na+ influx? I have been wondering if Na+ influx could have been a diluting factor in anterograde fills. If so, could ...
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2k views

How do dopamine agonists like amphetamine/methylphenidate affect acetylcholine signalling?

Do they increase it, or is the effect mostly neutral?
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30 views

Is Norepinephrine beta2 adrenomimetic?

I know that it has alpha1, alpha2 and beta1 effects. It has beta2 receptor where epinephrine can effect. However, to say that it is beta adrenomimetic, I am not sure. That is ligand binding beta2 ...
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89 views

Simultaneously using both hands - How does that work?

Is some part in one hemisphere the decision maker and "calling the shots" - controlling the opposite side's hand "directly" and controlling its own side's hand through the corpus callosum. Or: is ...
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44 views

Fastest and slowest action potential

When our instructor asked us about the speed of action potentials in cells, I told him that action potentials and two-wheelers travels at similar speeds. He thought that this is an 'interesting' way ...
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86 views

Relationship between action potentials and EEG recordings

It is possible that I am overthinking this but I have difficulties relating the neural activation to the amplitude and frequency of EEG recordings. For example; if at the EEG location P3/P4 we ...
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42 views

Neurology: spinal tract

I have had a few difficulties finding answers for the questions below. I have tried answering the first two myself; but, I am not sure they are correct or not. And I am not too sure about the third ...
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49 views

Nervous system: Pain and Pleasure?

If you have a constant pain in your body, why does a greater pain or pleasure make you not feel the original pain?
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115 views

Studying the fruitfly nervous system

I'm studying Neuroscience and Fruit Flies are a pretty big deal but I don't know as much as I think I should about them. Are there and comprehensive sources that I could read? I'd like a review of ...
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1answer
92 views

What in neurons and their connections changes during the process of learning?

I'm not sure if this question belongs more in physics or biology (or maybe even computer science)... but biology seemed to fit more. What changes in the state of our brains when we learn things? ...
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69 views

Radial Basis Function Network (RBF Network)

In the Wikipedia article on radial basis function network, I didn't understand what was meant by "center vector for neuron i", in other words "center of the RBF units called also prototype".
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1answer
791 views

What is the physiological difference between snorting/swallowing cocaine

I know that mucosa inside the nose absorbs cocaine molecules when snorting cocaine, but what difference is there compared to swallowing? Also more cocaine administration equals more cocaine molecules ...
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1answer
79 views

Eye Brain Mapping

If our eyes are separated by some kind of full proof barrier/isolation, is it possible that our brain can picture/visualize two different pictures at a time? How the brain will function in this ...
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1answer
136 views

Do nerve cells cause action potential in cardiac muscle?

I think the answer is no, but I am not 100% sure. If it was yes, then the dendrite of the nerve cell should each time receive a stimulus causing Na+ channels to open, when the contraction happen. ...
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1answer
148 views

How do axon terminals report to the soma?

It is important to bear in mind that the distance between a neuron's axon terminal and its soma can be extensive, up to about 1m in the human body. The fastest transport along the axon is 400mm/day ...
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55 views

Are there any neurotransmitters that trigger all neurons?

I'm reading into the basics of the nervous system, and am intrigued by neurotransmitters. I understand that certain neurotransmitters can trigger more than one neuron type, and may be used as ...
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1answer
2k views

Serotonin - Does being aroused make you sleepy?

My Psychology text book says Serotonin causes "Sleep, arousal levels and emotion" Does this really mean that when you are being aroused, Serotonin is released, which in turn makes you sleepy? If so, ...
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1answer
205 views

What is the biochemical reason for mental fatigue?

Is it known exactly why the brain needs sleep? What's dropping low / going high when we experience mental fatigue? I can see why low glucose could result in mental fatigue, are other reasons known?
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1answer
1k views

What are the positive and negative effects of insulin on cognitive function?

A UCLA study seems to imply that insulin interferes with cognitive function. The DHA-deprived rats also developed signs of resistance to insulin, a hormone that controls blood sugar and ...
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Immediate Early Genes during sleep

In Neuroscience 3rd ed by Bear et al. on page 607, immediate early genes are described as related to changing synaptic strength, yet have decreased expression during sleep. The explanation given is ...