For questions about the biology of the nervous system, from a macroscopic to microscopic perspective.

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1answer
26 views

What is the difference between 'stereoscopic depth' and 'crossed/uncrossed disparity'?

What is the difference between stereoscopic depth and crossed/uncrossed disparity, and specifically in terms of their use in the methods to manipulate visual stimuli to investigate depth-perception?
7
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2answers
3k views

Why is the order of white/grey matter different in the brain and spinal cord?

In the brain proper, grey matter forms the outer layer of the brain, and white matter forms the inner layer. In the spine, this is reversed: white matter forms the outer layer of the spine, and grey ...
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0answers
28 views

Why do thoughts take a non-zero length of time?

I was staring blankly at my desk thinking about how to overcome a programming task at work when it suddenly dawned on me I had spent the best part of half an hour trying to envision how this problem ...
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0answers
3 views

Can lithium withdrawal cause parathesia upon withdrawal?

Why would paresthesia develop after an individual is withdrawn from lithium due to chronic critical toxicity and continue for a protracted period of time? Is this a result of some kind of damage or ...
0
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1answer
22 views

If light travels at c, and the human nervous system's speed/perception speed<c, why aren't we not seeing or blind at some times? [on hold]

If light travels at c, and the human nervous system is a lot slower than light speed, therefore it would take a lot of time for us to process what we see, why aren't we blind to what's going around us ...
2
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1answer
194 views

How many possible states does a brain have?

Suppose I have a box, inside of which is a light which can be either on or off: it has exactly two states. Suppose I wanted to take some "snapshot" of the state of this device, and store all the ...
10
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1answer
334 views

Can stress or training influence the perception of time?

I have had this experience that I fell with my bike on an icy street. During the fall time seemed to slow down and I had an apparent age-long time window to stretch my hand and safely catch my fall. ...
3
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1answer
57 views

What is the role of (why )universal gas constant in Nernst equation?

The Nernst equation is an equation that relates the the total voltage, i.e. the electromotive force, of the full cell at any point in time to the standard electrode potential, temperature, activity, ...
3
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1answer
30 views

Membrane resistance of a neuron

I am about to simulate a neuron activity with the "Leaky Integrate and Fire" neuron model. But for that I need the membrane resistance. I was really looking a lot online, but I just cant find a value. ...
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0answers
15 views

Male Andropause fake or real [closed]

There are many people that would suggest testosterone supplement would be beneficial in your later mature years. I have a publically available study from the Australian library. 10,000 participant's ...
0
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2answers
31 views

Neurons - Which Types, How much Inputs/Outputs?

I plan to build a neural network that is as near as possible to a biological one. So I have 2 questions regarding properties of neurons in the brain and their types: What types are there and where ...
12
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1answer
807 views

What structures in the brain are called upon to strengthen coupling between bilateral movements?

It is very difficult for the normally-coordinated person to be able to pat his/her head and rub his/her stomach at the same time (or pick a similar activity). It seems to be possible to maintain the ...
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1answer
16 views

Neurons - Firing-Rate and Task? [closed]

I plan to build a neural network that is as near as possible to a biological one. So I have 2 questions regarding properties of neurons in the brain and their types: What is the firing rate (average)...
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0answers
19 views

Brain cell temperature [closed]

Given: a brain cell has an average temperature, T. If: perpetual brain activity pattern, X ; has an average conductive resistance, R; Therefore: Could it be rationally assumed that activity ...
3
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1answer
41 views

Can “fire together, wire together” be undone?

Are new connections continuously forged in the adult human brain, or do we just start all wired together and then prune until we have something we like?
6
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1answer
224 views

How does the inner ear encode sound intensity?

Different areas of the inner ear (the cochlea) are sensitive to different acoustic frequencies. Hence, the cochlea basically performs a fast Fourier transform on the audio signal. This spectral ...
6
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1answer
80 views

Is a network of neurons the only factor in memory?

Background I'm actually writing a science fiction novel set a couple decades in the future. Brains are not my field. I've done as much research as I could. In the story, the protagonist finds out he ...
3
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1answer
64 views

Can fMRI and EEG signals be generated from NEF models?

The basic function of the NEF is to map the outside world onto neurons, using the firing rates of the neurons. It also supports various neuron models. Have these firing rates been used to create EEG ...
6
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1answer
107 views

What regulates the strength of motor signals?

I've seen cognitive and robot models where the input signals from the sensors are directly used as the signal for outgoing motor control. This doesn't make much sense, because obviously we're able ...
9
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1answer
477 views

How do we hear our inner voice?

How do we perceive inner speech? Does it follow the same neural pathways as normal acoustic speech? If yes, what is the extent of overlap between the two neural pathways?
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0answers
38 views

Mechanism of ketamine in treatment of depression and anxiety?

What are the mechanisms by which ketamine reduces the symptoms of depression and anxiety?
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1answer
289 views

Why does anger “cloud the mind”?

There are a lot of anecdotes on frustration and anger inhibiting judgement and problem solving. Examples include "anger clouding the mind" in pop culture, or in programming, where a rule of thumb is ...
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0answers
63 views

Does STDP make the Hebbian learning rule redundant?

On Scholarpedia they introduce STDP (spike timing dependent plasticity) as a temporally asymmetric form of Hebbian learning, making it sound as if the original Hebbian rule still has relevance in ...
6
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2answers
114 views

What's the relation between firing of dopaminergic neurons and dopamine dispersion in terms of neurophysiological processes?

Question: How does the firing of dopaminergic neurons affect the dispersal of dopamine? Evidence of my limited familiarity with dopaminergic neurons and motivation for asking the question: Most of ...
10
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2answers
135 views

How is tone volume encoded?

I am wondering whether increasing the volume would result in (a) a neuron that was already firing to now increase its spike rate, (b) a different group of neurons to add their activity to the ...
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0answers
54 views

Does increased motor development always occur at the expense of speech development, or vice versa?

It is often said that infants / toddlers* develop in a focused manner. I am specifically interested in the notion that a quick development of speech occurs at the expense of motor skill development ...
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2answers
54 views

Can a hyperpolarized neuron fire action potentials?

Is there any chance that a neuron could fire when hyperpolarized? In that case, would the spike be different than usual?
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1answer
48 views

Why can't hemineglect patients be trained to actively pay attention to their neglected side?

I'm still having a hard time understanding the symptoms of hemineglect, mainly because perception and attention has been two peas of a pod for most of my experiences. A Scholarpedia article states ...
3
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1answer
58 views

How do neurons limit their input current?

I know that many neurons have an input current-spiking frequency (I-F) relationships, e.g. as seen here. However, all the I-F curves I've encountered show the input current in a fairly small range (...
9
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1answer
160 views

Does a split brain affect the inner voice?

In the Nature link provided, split brain reportedly alters the processing of sensory input (e.g., an aberrant performance on monocular visual tasks under laboratory conditions), and impairs motor ...
9
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1answer
101 views

How is epigenetic memory expressed in neurons?

Epigenetic memory is seen as the most evolutionarily plausible way of learning from experiences and gaining instinctual knowledge accross generations, as established by the answer to one of my ...
2
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1answer
31 views

Where can I find good references about the neuronal connections in various areas in the cortex?

As an example, I would like to know which Brodmann areas innervate the layer IV of area 10 in the brain. To which degree are these connections known? What are good books or other kinds of resources ...
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2answers
26k views

Why are some people unable to easily memorize the lyrics to a song?

Although I have listened some songs hundred of times I can't sing the lyrics to any of these songs from beginning to end without pauses. However I am able to whistle the whole song without difficulty. ...
2
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1answer
58 views

Does oxytocin reduce brain activity?

In the book "Psychologie" by Richard J. Gerrig, Philip Zimbardo I read there are studies claiming that: "die gegenwärtige Forschung legt nahe, dass das Hormon eine facettenreiche Rolle bei ...
4
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1answer
89 views

Can two neurons in the brain be connected more than once?

Can two given neurons in the human brain can be directly connected more than once, either mutually or in the same or direction? Also, can the same neuron have transitive connections to itself (in ...
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1answer
51 views

What is the relationship between visual attention network and visual stream (Two-streams hypothesis)?

There are two visual attention networks proposed by Maurizio Corbetta and Gordon L. Shulman (2002). These are top-down and bottom-up attention networks. One system, which includes parts of the ...
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1answer
28 views

Is there visual focus during a saccade?

Has anyone succeeded in measuring where the focus is between saccades? Through some kind of nonintrusive brainscan perhaps? I would like to be able to draw with my thought :) (Something similar would ...
5
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1answer
77 views

Is touch sensitivity higher for females?

I read a long time ago that in a study of two-week old infants response to touch, the female babies were far and away more sensitive. In most gender comparisons, there are the familiar "two humps" in ...
3
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1answer
75 views

How do people with a split brain experience reality?

Some people with severe epileptic seizures have the connection between their two brain halves cut. How appears reality for them, and why does this procedure helps them?
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1answer
32 views

What is the purpose of non-spiking and anaxonic neurons?

What is the purpose of non-spiking neurons and anaxonic neurons in neural tissue?
5
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2answers
111 views

Can LSD connect sensory regions in the brain?

How is it possible that after using LSD you can hear sounds and see colours? I have my own experience with this phenomenon. When I´m lying totally relaxed in bed and suddenly a door is closed loudly,...
2
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1answer
27 views

What is the relation of visual quality and distance from the central field of view?

I have read somewhere that Our visual perception degrades non-linearly with distance from the fovea. However, it was not referenced. I was wondering if there is a reference talking about this?...
3
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2answers
129 views

Can normal brain activity arise from no (or random) brain activity?

I wonder how stable the brain is as a dynamical system. In other words, how important the state (current activation) of the brain is for its further functioning. Would the brain recover from a state ...
9
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2answers
121 views

Is the split-brain, dual consciousness experiment from Rhawn Joseph valid?

I have been reading about the problem of possible dual consciousness in split brain patients and I came across this wikipedia page. In the "other experiments" section, the two last paragraphs about ...
3
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2answers
51 views

Do studies exist that can map specimens of neocortex to the functions they perform(ed) in vivo?

Much brain research has proposed that the brain (the neocortex, esp.) is set up in areas - an area for faces, an area for language, etc.. The experiments typically go 1) damage an area 2) observe ...
6
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1answer
65 views

How much of brain power consumption is for information

As previously answered on this site, the brain uses 20W of power. However, how much of this power consumption is for information processing and how much of it is for maintenance of biological ...
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0answers
72 views

Does a person really have free will? [closed]

Psychology and other cognitive sciences study human thoughts and emotions as reflections to biological operations. These operations are involuntary and thus result in determined behaviour. Does this ...
3
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1answer
39 views

What is the function of the connection between the two halves of the thalamus?

What kind of direct exchange do we have between the two halves of the thalamus, whether going through the thalamic adhesion or not? Do we know what parts of left and right thalamus are connected and ...
2
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1answer
20 views

What is the definition of a receptive field?

I have read the wikipedia article on receptive fields (RFs). There, a receptive field is defined as: The receptive field of an individual sensory neuron is the particular region of the sensory ...
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1answer
28 views

What is the location of the center-surround receptive fields of retinal ganglion cells?

I have read wikipedia article about receptive fields of visual system and it states the following: The receptive field is often identified as the region of the retina where the action of light ...