{"id":25274,"date":"2018-03-28T20:02:47","date_gmt":"2018-03-28T20:02:47","guid":{"rendered":"http:\/\/www.kurzweilai.net\/?p=310624"},"modified":"2018-03-30T21:00:01","modified_gmt":"2018-03-30T21:00:01","slug":"the-brain-learns-completely-differently-than-weve-assumed-new-learning-theory-says","status":"publish","type":"post","link":"https:\/\/hoo.central12.com\/fugic\/2018\/03\/28\/the-brain-learns-completely-differently-than-weve-assumed-new-learning-theory-says\/","title":{"rendered":"The brain learns completely differently than we’ve assumed, new learning theory says"},"content":{"rendered":"
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(credit: Getty)<\/p><\/div>\n

A revolutionary new theory contradicts a fundamental assumption in neuroscience about how the brain\u00a0learns. According to researchers at Bar-Ilan University<\/a> in Israel led by Prof. Ido Kanter<\/a>, the theory promises to transform our understanding of\u00a0brain dysfunction and may lead to advanced, faster, deep-learning algorithms.<\/p>\n

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A biological schema of an output neuron, comprising a neuron’s soma (body, shown as gray circle, top) with two roots of dendritic trees (light-blue arrows), splitting into many dendritic branches (light-blue lines). The signals arriving from the connecting input neurons (gray circles, bottom) travel via their axons (red lines) and their many branches until terminating with the synapses (green stars). There, the signals connect with dendrites (some synapse branches travel to other neurons), which then connect to the soma. (credit: Shira Sardi et al.\/Sci. Rep)<\/p><\/div>\n

The\u00a0brain\u00a0is a highly complex network containing billions of neurons. Each of these neurons communicates simultaneously with thousands of others via their synapses. A neuron collects its many synaptic incoming signals through dendritic trees.<\/p>\n

In 1949, Donald Hebb suggested that learning occurs in the\u00a0brain\u00a0by modifying the strength of synapses. Hebb’s theory<\/a> has remained a deeply rooted assumption in neuroscience.<\/p>\n

Synaptic vs. dendritic learning<\/strong><\/p>\n

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In vitro<\/em> experimental setup. A micro-electrode array\u00a0comprising 60 extracellular electrodes separated by 200 micrometers, indicating a neuron patched (connected) by an intracellular electrode (orange) and a nearby extracellular electrode (green line). (Inset) Reconstruction of a fluorescence image, showing a patched cortical pyramidal neuron (red) and its dendrites growing in different directions and in proximity to extracellular electrodes. (credit: Shira Sardi et al.\/Scientific Reports adapted by KurzweilAI)<\/p><\/div>\n

Hebb was wrong, says Kanter. \u201cA new type of experiments strongly indicates that a faster and enhanced learning process occurs in the neuronal dendrites, similarly to what is currently attributed to the synapse,\u201d Kanter and his team suggest in an open-access paper<\/a> in Nature’s Scientific Reports<\/em>, published Mar. 23, 2018.<\/p>\n

\u201cIn this new [faster] dendritic learning process, there are [only] a few adaptive parameters per neuron, in comparison to thousands of tiny and sensitive ones in the synaptic learning scenario,\u201d says Kanter. \u201cDoes it make sense to measure the quality of air we breathe via many tiny, distant satellite sensors at the elevation of a skyscraper, or by using one or several sensors in close proximity to the nose,?\u201d he asks. \u201cSimilarly, it is more efficient for the neuron to estimate its incoming signals close to its computational unit, the neuron.\u201d<\/p>\n

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Image representing the\u00a0current synaptic (pink) vs. the new dendritic (green) learning scenarios of the brain. In the current scenario, a neuron (black) with a small number (two in this example) dendritic trees (center) collects incoming signals via synapses (represented by red valves), with many thousands of tiny adjustable learning parameters. In the new dendritic learning scenario (green) a few (two in this example) adjustable controls (red valves) are located in close proximity to the computational element, the neuron. The scale is such that if a neuron collecting its incoming signals is represented by a person’s faraway fingers, the length of its hands would be as tall as a skyscraper (left). (credit: Prof. Ido Kanter)<\/p><\/div>\n

The researchers also found that weak synapses, which comprise the majority of our\u00a0brain and were previously assumed to be insignificant, actually play an important role in the dynamics of our\u00a0brain.<\/p>\n

According to the researchers, the new learning theory may lead to advanced, faster, deep-learning algorithms and other artificial-intelligence-based applications, and also suggests that we need to reevaluate our current treatments for disordered\u00a0brain\u00a0functionality.<\/p>\n

This research is supported in part by the TELEM grant of the Israel Council for Higher Education.<\/p>\n

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Abstract of\u00a0Adaptive nodes enrich nonlinear cooperative learning beyond traditional adaptation by links<\/em><\/h4>\n

Physical models typically assume time-independent interactions, whereas neural networks and machine learning incorporate interactions that function as adjustable parameters. Here we demonstrate a new type of abundant cooperative nonlinear dynamics where learning is attributed solely to the nodes, instead of the network links which their number is significantly larger. The nodal, neuronal, fast adaptation follows its relative anisotropic (dendritic) input timings, as indicated experimentally, similarly to the slow learning mechanism currently attributed to the links, synapses. It represents a non-local learning rule, where effectively many incoming links to a node concurrently undergo the same adaptation. The network dynamics is now counterintuitively governed by the weak links, which previously were assumed to be insignificant. This cooperative nonlinear dynamic adaptation presents a self-controlled mechanism to prevent divergence or vanishing of the learning parameters, as opposed to learning by links, and also supports self-oscillations of the effective learning parameters. It hints on a hierarchical computational complexity of nodes, following their number of anisotropic inputs and opens new horizons for advanced deep learning algorithms and artificial intelligence based applications, as well as a new mechanism for enhanced and fast learning by neural networks.<\/p>\n","protected":false},"excerpt":{"rendered":"

A revolutionary new theory contradicts a fundamental assumption in neuroscience about how the brain learns. According to researchers at Bar-Ilan University in Israel led by Prof. Ido Kanter, the theory promises to transform our understanding of brain dysfunction and may lead to advanced, faster, deep-learning algorithms. The brain is a highly complex network containing billions of neurons. Each of […]<\/p>\n","protected":false},"author":454,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[46,49,43],"tags":[],"class_list":["post-25274","post","type-post","status-publish","format-standard","hentry","category-airobotics","category-cognitive-scienceneuroscience","category-news"],"_links":{"self":[{"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/posts\/25274"}],"collection":[{"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/users\/454"}],"replies":[{"embeddable":true,"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/comments?post=25274"}],"version-history":[{"count":1,"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/posts\/25274\/revisions"}],"predecessor-version":[{"id":25275,"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/posts\/25274\/revisions\/25275"}],"wp:attachment":[{"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/media?parent=25274"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/categories?post=25274"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/tags?post=25274"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}