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14 votes
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What is the information storage capacity of the human brain?

Disclaimer: Quantifying the capacity of the human brain is quiet complex as you might imagine. And although in cognitive neuroscience we often compare the brain to computers this is not an exact ...
Comte's user avatar
  • 1,196
11 votes
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Is back-prop biologically plausible?

Biological Plausibility of Back-Prop No, the algorithm of back-prop (BP) isn't biologically plausible. However, there are other means which involve propagating the error through multiple layers of ...
Seanny123's user avatar
  • 8,853
8 votes

Is a network of neurons the only factor in memory?

Answer Yes, theoretically. Now According to my ongoing informal research, there are two sides of brain preservation innovation: 1) the preservation and mapping (building) the connectome; and 2) the ...
SoAwesomeMan's user avatar
8 votes

Are there neural loops within a column or an area of the cortex?

I've read evidence for single-neuron, two-neuron, and larger loops/cycles throughout the cortex, including intralaminar, interlaminar, and interareal neural loops. But it would take me far too long to ...
John Pick's user avatar
  • 2,193
8 votes
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What role do circular network structures play in neural networks?

In contrast to artificial neural networks, which are almost all feed-forward architectures, networks in biological brains are highly recurrent. In the networks of cortex, the majority of synaptic ...
Dylan Richard Muir's user avatar
7 votes

Can a sufficiently complex ANN simulate consciousness?

David Chalmers has argued against the thermostat view, suggesting that adaptation to the environment is not sufficient. John Searle also disagrees that the current state of machine learning is capable ...
noumenal's user avatar
  • 628
6 votes

Delay time of Transmitting the information from one neuron to another in brain

You mentioned the neurotransmitters released at the synaptic cleft, but seem to be interested in the complete picture. An action potential is actually very slow to propagate down an axon with a ...
aiwyn's user avatar
  • 503
6 votes
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The computer model of the brain

This question's reference to a classical computer refers to a "Turing Machine" style of computation, also known as a knowledge system, in which decisions and possible results are pre-...
6 votes

Why can't human thoughts be stored in metals?

First off, you mention 'metals'. What is a metal? In common speech, a metal is a shiny material that conducts electricity and heat well. In physics, a metal is regarded as a substance capable ...
AliceD's user avatar
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6 votes
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Why is the occipital lobe behind instead of in front?

From the retina, visual signals next travel through the lateral geniculate nucleus of the thalamus. This nucleus is quite centrally located, about as much in the middle of the brain as possible, and ...
Bryan Krause's user avatar
  • 7,481
5 votes

What does it mean when we say that "a neuron connects to a certain cortical layer"?

Short answer In complicated matters like neural connections in a layered cortex, it is all about semantics. One should carefully place statements in their context and deduce their meaning. ...
AliceD's user avatar
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5 votes
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"Nested Neurons": Are they biologically plausible?

Disregarding the feasibility of neurons within neurons in silico, the answer to Is there any evidence for neurons existing within other neurons in humans or other organisms? from a practical, ...
AliceD's user avatar
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5 votes

Do direct cortical pathways exist in the visual system, or do they all go via the thalamus?

Short answer Intracortical projections can be routed directly to other cortical areas (cortico-cortical projections), or via the thalamus (cortico-thalamo-cortical projections). Background ...
AliceD's user avatar
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5 votes
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Are there animals with only excitatory neurons?

Not in any well-studied animal; for example, C. elegans certainly has both excitatory and inhibitory neurons. Even in animals with very simple and poorly understood nervous systems (for example, ...
Bryan Krause's user avatar
  • 7,481
5 votes
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Are neurons the wrong shape to model neural networks?

A: Not all neurons have many short dendrites and a single long axon. In fact, the majority of them do not have this shape. Cerebellar granule cells, which are the most numerous neurons in the brain (...
user287279's user avatar
  • 1,835
4 votes

Why can't we use 100% of the brain in a certain moment?

Neurons are extraordinarily expensive to make, maintain, and use (Laughlin et al, 1998; Stone 2018). Half of a child's energy budget, and a fifth of an adult's budget, is required just to keep the ...
James V Stone's user avatar
4 votes

Why can't we use 100% of the brain in a certain moment?

Unlike a computer, where the circuitry is information agnostic (it can represent anything digital), neural networks (both biological and artificial) are not. The organization of neurons (their ...
Arnon Weinberg's user avatar
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4 votes
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Is the Resting Potential and Action Potential Thresholds the same across all neurons in a network?

In short no. The speed at which and Action Potential (AP) occurs, resting membrane potential, and threshold to AP all vary across types of neutron. See the graph below (Bean, 2007) The reasons for ...
Comte's user avatar
  • 1,196
4 votes
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What does "Convolutional" signify in "Convolutional Neural Network"?

Convolution is a technical term, and comes from the signal processing field. Unfortunately, it is easily confused with "convoluting". Effectively, "to convolve" means to pick a small "window", slide ...
Justas's user avatar
  • 1,537
4 votes
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Is neurogenesis driven by prediction error?

This question is very difficult to provide a satisfactory answer to because the technical neuroscience definition of prediction error is murky and since your question brings up machine learning then ...
aiwyn's user avatar
  • 503
4 votes

Are there neural loops within a column or an area of the cortex?

Yes, absolutely there are loops, and they can occur on a very small spatial scale. Do we have a proof of local loops in the cortex? Here are a few papers that describe experimental quantification of ...
Dylan Richard Muir's user avatar
4 votes
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Biological plausibility of RBMs

First, I want to clarify a few things. Deep Learning simply refers to any learning on a deep (more than one hidden layer) neural network, where the learning happens (i.e. parameters are adjusted) at ...
hunse's user avatar
  • 156
4 votes
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What is the difference between attractor and recurrent network?

Many recurrent networks have attractors. For example, the BAM (bidirectional associative network) is a recurrent network: one input is presented and the network cycles until no more changes are seen ...
Denis Cousineau's user avatar
4 votes

Does the brain's architecture change while growing up?

Short answer The brain is a highly dynamic organ that changes constantly through life. During adulthood, there is a general decline in the number of cells. Memory formation is generally thought to be ...
AliceD's user avatar
  • 20.7k
4 votes
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What is the difference between principal neurons and pyramidal cells?

Short answer In the cortex, pyramidal cells and projection neurons can be used interchangeably, as both terms refer to the same cells. Background One way to classify neurons is based on their ...
AliceD's user avatar
  • 20.7k
4 votes

Myelin and Myelin Sheath

As Wikipedia points out: Myelin is a lipid-rich (fatty) substance formed in the central nervous system (CNS) by glial cells called oligodendrocytes, and in the peripheral nervous system (PNS) by ...
Chris Rogers's user avatar
  • 12.3k
4 votes

ML/Neuroscience: TensorFlow vs PyTorch vs Keras for bulding NN models of the nervous system?

If you're looking at computational models of actual neurons and biological neural networks, there are a number of tools out there which are specifically for the purpose. The most commonly used are: ...
Martino's user avatar
  • 186
3 votes

Is back-prop biologically plausible?

I don't know much about this, but here goes anyway. I heard that the reason backprop isnt biologically plausible is that it requires global control/coordination for the propagation of the gradients. (...
Alexander Telfar's user avatar
3 votes
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Function of heart neural network?

The heart isn't really "controlled" by the nervous system in the same way, say, the limbs are. Heart muscle cells (cardiac myocytes) beat with a steady rhythm even in complete isolation. Collections ...
TheBlackCat's user avatar
3 votes

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

My short answer would be that there is no clear relationship between these two models about how visual information processing works in the brain. However, the terminology and evidence overlaps ...
splint's user avatar
  • 1,113

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