Questions tagged [brain]

The primary component of the central nervous system, which, along with the spinal cord, controls the body of bilaterally symmetrical beings.

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If the Brain can store as much information as a billion hard disks why cant i memorize a single word document of random letters?

I read a lot of articles on this and all seem to agree that the brain storage in neural connections is tremendous but that doesnt explain why we forget things so easily and have such a modest memory ...
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health and well being

I have heard that the earth's magnetic field will effect you when you sleep. My wife and I lie in an east/west orientation with our heads to the west. Does the direction you lay in bed and sleep ...
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Is Brain Eye connections reversed in all animals or just Humans?

I know that Brain Eye connections are reversed in Humans, Left Hemisphere controls the Right eye/Right side of the body Right Hemisphere Controls the Left eye/Left side of the body Is it true in ...
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Alzheimer's disease - Hyperexcitability

I am trying to read literature on Alzheimer's disease. A very important phenomenon that occurs in AD patients, is hyperexcitability in neurons close to A-beta concentrations. Some authors only ...
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What is the significance of the amplitude of brain waves?

What does the amplitude of brain waves represent and to what neuronal activities is this amplitude related to? For example, in a hypothetical situation, the frequency of brain waves is kept the same, ...
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Would it be possible to determine the strength of each neural connection in a connectome data set?

I understand that a connectome is a map of connections between neurons. Would it be possible with current day technology to create a more detailed map that gives not only the connections themselves ...
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How can the material brain tell the material brain which memory it wants the material brain to recall?

I was looking around the internet for any scientific research that shows the material brain can operate the material brain and I couldn't find any. It seems like consciousness and self awareness ...
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What is a neuronal loop?

Stanford Medicine's OCD page says that Many investigators have contributed to the hypothesis that OCD involves dysfunction in a neuronal loop running from the orbital frontal cortex to the ...
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Why isn't hearing the same as tasting? How do we feel and differentiate external stimuli?

When I was at school, I learned that: Skin, tongue, ears, and other sensory organs have sensors/convertors that turn external environment stimuli into "electric" signals. Neurons send information as ...
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Why doesn't the spinal cord get thicker the further up we go?

The cervical and lumbar enlargements exist on the spinal cord as a result of the increased nerve input/output required for the arms and legs respectively. However, I don't understand how the ...
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Schematic of neural lineage tree and position of Choroid Plexus cells

I am trying to understand which are the different type of progenitors in the human brain and I am currently following this schematic. My question is, are Choroid Plexus cells progenitors to Radial ...
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Breakdown of functional human genome by organ/What fraction of the functional human genome is devoted specifically to brain functioning?

Of course, there won't be a precise known answer to the question, as it is not even known precisely what percentage of the genome is functional in the first place - but I am still looking for research....
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Why does it take so long for the human brain to develop from an evolutionary point of view?

I have read that it takes about 25 years for the brain to be fully developed. Coincidentally, humans from the Neolithic and Bronze Age had a very short life expectancy, in fact most of their life ...
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How does high-intensity aerobic exercise affect the brain?

I have been reading articles claiming that serotonin, endorphins and BDNF are produced during exercise, but they never mention the intensity or duration of exercise for this to happen. To not make ...
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Has anyone attempted to add extra senses to a creature through a BCI/Neural interface?

Basic BCI's (Brain computer interfaces) have been available for quite a while now and allow users to preform rudimentary tasks such as moving prosthetic limbs with force-feedback or moving a mouse on ...
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What does microglia process length tell us?

I'm reading a study investigating traumatic brain injury and alcohol consumption and the researchers measured microglia process length as an indicator of brain damage. I was wondering what that would ...
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Are there “old” neuron types in the neocortex?

"Old" may mean a neuron type that appeared early in the tree of life, and it may mean – going together – that it comes early in the lineage tree of neuronal cells, rooted in the fertilized ...
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Inhibitory functional connectivity

Functional connectivity may be defined as »the temporal correlation between spatially remote neurophysiological events, expressed as deviation from statistical independence across these events in ...
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Are there nuclei with “real” interneurons?

In Kandel's "Principles of Neural Sciences" in the chapter about the anatomical organization of the brain one reads (p. 323, 4th ed.): »Although a variety of [relay] neurons are involved at each ...
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How sharp are the borders between Brodmann areas?

How does the border between two Brodmann areas look like in Nissl stains? How large is the transition zone where one cannot tell to which of the two areas a neuron belongs to? How many neurons are ...
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Two-dimensional anatomical maps of the brain

The three-dimensional anatomy of the brain is hard to comprehend visually. But the exact spatial relations between the parts of the brain and their shapes are (sometimes) not so important because ...
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Which parts of the cerebral cortex don't belong to the neocortex?

In the Wikipedia article on the cerebral cortex one reads: »Most of the cerebral cortex consists of the six-layered neocortex.« Accordingly, in the Wikipedia list of regions in the human brain, ...
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Is relative timing of signal transmission between neurons along axons and through synapses relevant in the brain?

A neuron may be part of a nerve connection between two endpoints, transferring a signal that is not very sensitive to variations in signal propagation speed. But a neuron inside a cluster of ...
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Umbrella term for “parts of the brain”

I am looking for an umbrella term for general "parts of the brain", esp. for (somehow arbitrary) "subsets of neurons". For the tree of life there is an umbrella term for all kinds of taxonomic groups ...
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What does the thalamus consist of?

There is a long list of thalamic nuclei which are somehow embedded in the thalamus, a "large mass of gray matter located in the dorsal part of the diencephalon", according to Wikipedia. I wonder what ...
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Functional roles of firing patterns

Eugene Izhikevich reports – e.g. here – a plethora of neural firing patterns: My question is two-fold: Is there an overview which types of neurons are capable of (and typically exhibit) ...
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Parts of the brain pivotal for maintaining consciousness

From an answer to another question (on conscious experiences by coma patients) I have learned that no conscious experiences, complex thoughts, or complex emotions can occur when one is in coma (...
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How does the dopamine spike from drugs compare quantitatively to pleasurable non-drug activities?

I did find this popular press article that quotes a researcher offering the following quantification: "in lab experiments done on animals, sex causes dopamine levels to jump from 100 to 200 units, and ...
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To what extent does loss of neurons in the substantia nigra affect movement?

There is a substance known as MPTP that is capable of crossing the blood-brain barrier. Once it does so, it is metabolized into a toxin called MPP+, which then selectively destroys dopaminergic ...
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Can brain activity be restored after being stopped, assuming no cellular damage?

I was reading about cryonic preservation recently. In a separate place on the Internet, I've read that once brain activity stops and brain death occurs, the person is dead with no hope of recovery. ...
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Why didn't the human Cerebrum evolve to have granule cells like the Cerebellum does?

The Cerebellum is much smaller compared to the Cerebrum yet it contains more than half of the total neurons contained in the brain. That's mainly due to the granule cells in the Cerebellum which ...
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Does the cranial dura consist of the periosteum? and if not, then is there a mistake in my textbook?

My textbook (Neuroanatomy an illustrated colour text) states that: The spinal dura and much of the cranial dura are separate from the periosteum, which forms the inner lining of the surrounding ...
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Janina kolkiewicz who faced Lazarus phenomenon

I've just read about Janina kolkiewicz case who faced Lazarus phenomenon and I was wondering how could her brain and organs survive these long hours without oxygen?
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Gaba and Magnesium

I read read that magnesium divalent ion binds to gaba receptors and induces the same effects as if gaba has binded. Does anyone know what happens to the gaba that would have been synthesised and ...
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Do new neurons divide propotionally?

Do new neurons divide propotionally? if i try to improve my reasoning skills,are the new neurons only made for that specific region of the brain that controls reasoning skill? i have heard that one ...
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adverse effects of reduced food variety on microbiome

We often see, in science fiction, food being produced from, say, algae or yeast. Any idea what could be the effect of such a limited diet on the gut microbiome? Could there be any side-effect that ...
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Can a brain be damaged by overstimulation?

I am wondering what, if any, long term health effects there are from high levels of brain activity. I don't mean cases where a brain is being artificially stimulated, but rather where there is a high ...
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Why does music give you emotions?

Why do we feel emotions when we hear music? Click to see video How can a set of tones arranged in a specific order and timing make you feel sad or happy? I read that music can somehow trigger the ...
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Is sexual desire stronger in men than women?

Usually in popular culture it's considered men sexual desire is stronger than women. This seems to be congruent with the availability of sexual related items for men and women, such as magazines, ...
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What determines the influx of calcium ions in the voltage-gated ion channels?

Calcium channels play a crucial role in neuronal signaling by helping the synaptic vesicles to fuse through the synaptic active zone and release their neurotransmitters. My question is, at a given ...
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Why does brain invert the image formed on retina? [duplicate]

I have been studying about the human eye and it's working in school for some time. I came across something. I have been taught that the image formed on the retina of the eye by the lens is inverted ...
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Identify brain junk - What are all the known intracellular and extracellular substances which build up with age and clog the brain?

What are the known junk substances which the body is unable to dispose of and which build up in the brain with age to eventually causes age related problems? Starting with the most obvious ones: ...
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What is the water and fat composition of the human brain?

Everywhere I look online says the brain is about 60% fat. But when it comes to water, I see numbers like 70-75%. One webpage even makes both those claims back to back! That doesn't make any sense. So ...
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Looking for books on How the limbic system works and it role in non-verbal behavior

This is my first post. I just read and I'm currently studying a book called "How everybody works" as a guide to understanding nonverbal behaviors. After I'm done studying it and while I experiment ...
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How do parasites “reprogram” brains?

Dicrocoelium dendriticum is a parasite that uses ants as a second intermediate host (which means that ants aren't its primary host/target, but are rather a temporary host to help reach their main/...
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Where would I point to if I wanted to indicate the location of the anterior insular cortex?

I understand research suggests the anterior insular cortex is where human empathy originates. The images I found researching the location of the AIC do not give me a clear sense of where it is in ...
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What makes synaptic vesicle release probabilistic?

The fusion of synaptic vesicles (SVs) with the plasma membrane of the active zone (AZ) upon arrival of an action potential (AP) at the presynaptic compartment is a tightly regulated probabilistic ...
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Pharmacokinetics and cell-membrane permeability of Adenosine triphosphate disodium hydrate

【My Question】 (1) Please tell me the pharmacokinetics of this ATP (or Adenosine triphosphate disodium hydrate) when it is administered orally or intravenously. In particular, Does this material has ...
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Does the prefrontal cortex fold over the diencephalon (limbic lobe) during embryogenesis?

The frontal lobe as the top of the vertebrate brain, does it fold over the diencephalon during embryogenesis and development of the brain?
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Cerebral/Cerebellar Cortex versus Deep Nuclei

I have troubles using the terms Cortex & Deep Nuclei, and 'Nuclei' in general. From what I understand, a brain has '3 matter types in accordance to anatomical locations' Superficial Grey matter - ...

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