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Neurons Found To Be Similar To U.S. Electoral College

Date:
September 15, 2009
Source:
Northwestern University
Summary:
A study has found that certain neurons, at one level, operate a little like the US Electoral College. The findings provide evidence supporting the "two-layer integration model," which attempts to explain how neurons integrate synaptic inputs. Each dendritic branch receives electrical inputs and decides on one signal to send the axon. The axon receives signals from the dendrites, much like electoral votes coming in from state elections, and a final decision is made.

Artist's rendering of neurons.
Credit: iStockphoto

A tiny neuron is a very complicated structure. Its complex network of dendrites, axons and synapses is constantly dealing with information, deciding whether or not to send a nerve impulse, to drive a certain action.

It turns out that neurons, at one level, operate like another complicated structure -- the United States, particularly its system of electing a president, through the Electoral College.

A new Northwestern University study provides evidence that supports the "two-layer integration model," one of several competing models attempting to explain how neurons integrate synaptic inputs. The findings are published in the journal Neuron.

In this model, each dendritic branch of a neuron receives and integrates thousands of electrical inputs, deciding on just one signal to send to the axon. The axon then receives signals from all the dendrites, much like electoral votes coming in from state elections, and a final decision is made. The result could be an output in the form of an impulse, or action potential, or no action at all.

"There are more than 100 billion neurons in the human brain, so detailed knowledge of individual neurons will lead to a better understanding of how the brain works, including the processes of learning and memory," said Nelson Spruston, who led the research team. He is professor of neurobiology and physiology in the Weinberg College of Arts and Sciences at Northwestern.

Using electron microscopy, the researchers made a three-dimensional reconstruction of individual dendritic branches of mammalian hippocampal neurons with all their synapses. They found that the synapses get progressively smaller, or weaker, between the origin of the dendrite's branch and its end. This distribution supports the two-layer integration model.

Output from each branch, rather than each synapse, is sent to the axon. This design of the neuron implies that local integration is very important to the cell. After information is integrated locally within a branch, there is a global integration within the axon.

"Each of these neurons is a complicated network in and of itself," said William Kath, an author of the study. He is professor of engineering and applied science in the McCormick School of Engineering and Applied Science and is co-director of the Northwestern Institute on Complex Systems.

In addition to Spruston and Kath, other authors of the paper are Yael Katz, Vilas Menon, Daniel A. Nicholson and Yuri Geinisman, all from Northwestern.


Story Source:

The above story is based on materials provided by Northwestern University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Katz et al. Synapse Distribution Suggests a Two-Stage Model of Dendritic Integration in CA1 Pyramidal Neurons. Neuron, 2009; 63 (2): 171 DOI: 10.1016/j.neuron.2009.06.023

Cite This Page:

Northwestern University. "Neurons Found To Be Similar To U.S. Electoral College." ScienceDaily. ScienceDaily, 15 September 2009. <www.sciencedaily.com/releases/2009/09/090914172650.htm>.
Northwestern University. (2009, September 15). Neurons Found To Be Similar To U.S. Electoral College. ScienceDaily. Retrieved July 23, 2014 from www.sciencedaily.com/releases/2009/09/090914172650.htm
Northwestern University. "Neurons Found To Be Similar To U.S. Electoral College." ScienceDaily. www.sciencedaily.com/releases/2009/09/090914172650.htm (accessed July 23, 2014).

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