19 NOV 2015 by ideonexus

 A Single Neuron Can Recognize Patterns

Neocortical neurons have thousands of excitatory synapses. It is a mystery how neurons integrate the input from so many synapses and what kind of large-scale network behavior this enables. It has been previously proposed that non-linear properties of dendrites enable neurons to recognize multiple patterns. In this paper we extend this idea by showing that a neuron with several thousand synapses arranged along active dendrites can learn to accurately and robustly recognize hundreds of unique p...
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06 FEB 2015 by ideonexus

 A Worm's Mind in a Lego Robot Body

The nematode worm Caenorhabditis elegans (C. elegans) is tiny and only has 302 neurons. These have been completely mapped and the OpenWorm project is working to build a complete simulation of the worm in software. One of the founders of the OpenWorm project, Timothy Busbice, has taken the connectome and implemented an object oriented neuron program. The model is accurate in its connections and makes use of UDP packets to fire neurons. If two neurons have three synaptic connections then when ...
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21 APR 2014 by ideonexus

 Perceptrons and Sigmoid Neurons

A way you can think about the perceptron is that it's a device that makes decisions by weighing up evidence. Let me give an example. It's not a very realistic example, but it's easy to understand, and we'll soon get to more realistic examples. Suppose the weekend is coming up, and you've heard that there's going to be a cheese festival in your city. You like cheese, and are trying to decide whether or not to go to the festival. You might make your decision by weighing up three factors: 1. Is...
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Two tool for machine learning.

21 JUN 2013 by ideonexus

 von Neumann Correctly Hypothesizes How Memory Works

The question of the physical embodiment of this memory remains. For this, various authorrs have suggested a variety of solutions. It has beeen proposed to assume that the thresholds—orr, more broadly stated, the stimulation criteria—^f or various nerve cells change with time as functions of the previous history of that cell. Thus frequent use of a nerve cell might lower its threshold, i.e. ease the requirements of its stimulation, and the like. If this were true, the memory would reside i...
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Neurons that get used more often become easier to use. He's just speculating, but his description is spot on.

26 APR 2012 by ideonexus

 Number of Neuron Connection in the Brain

Each nerve cell receives connections from other nerve cells at six sites called synapses. But here is an astonishing fact—there are about one million billion connections in the cortical sheet. If you were to count them, one connection (or synapse) per second, you would finish counting some thirty-two million years after you began. Another way of getting a feeling for the numbers of connections in this extraordinary structure is to consider that a large match-head's worth of your brain conta...
Folksonomies: biology brain numbers
Folksonomies: biology brain numbers
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The different possible number of connections outnumbers the particles in the Universe (this is questionable).