Tag Archives: brain

Neuron visualizations

In my last post I have described what I believe is way to the true artificial intelligence. I started with search for neurons/layers/minicolumns/columns visualization. So I can learn about its organization and possibly function. If I were you I would first study Why Neurons Have Thousands of Synapses so you can get to the level of understanding I have when writing this post 🙂

Neuron

Did you know that similar neuron visualizations does not look like real pyramidal neurons in brain?

1280px-Neuron.svg.png

source: WikiMedia

Real neurons used in neocortex looks more like this:

layerscortex

source: LiveJournal

For me are interesting this facts:

  • axon (visualised as thin line without small perpendicular lines – dendrites) is not single wire, it branches – some branches turns upwards, some goes goes on the same level and one goes downwards
  • dendrite segments (lines with small perpendicular lines – dendrites) are of three types:
    • proximal – dendrite segments on soma (body) or close to it
    • basal – relatively short dendrite segments coming horizontally from soma
    • apical – long dendrites heading upwards

Another visualization may be:

Layers

nissl2

source: med.utah.edu

FIG16Cortex3D

source: med.utah.edu

 

FIG7MW

source: uthsc.edu

Columns/Minicolumns

Columns should represent group of similar features (short lines in visual cortex in image below) and minicolumns single feature (line with angle 45 degrees). Each neocortex region is composed of this. So we may say similar features are grouped.

columns

source: med.utah.edu

Visualization of rat’s 4 columns:

Minicolumns:

  • It seems that there is no strong evidence about minicolumns functionality and even existence
  • It is questionable whether column is strictly divided or there are overlaps
  • It seems that smaller distance between minicolumns is presented in brains suffering by autism
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