soc - Self-Organized Criticality (SOC) Tino Duong...

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Self-Organized Criticality (SOC) Tino Duong Biological Computation
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Agenda l Introduction l Background material l Self-Organized Criticality Defined l Examples in Nature l Experiments l Conclusion
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SOC in a Nutshell l Is the attempt to explain the occurrence of complex phenomena
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Background Material
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What is a System? l A group of components functioning as a whole
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Obey the Law! l Single components in a system are governed by rules that dictate how the component interacts with others
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System in Balance l Predictable l States of equilibrium Stable, small disturbances in system have only local impact
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Systems in Chaos l Unpredictable l Boring
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Example Chaos: White Noise
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Edge of Chaos
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Emergent Complexity
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Self-Organized Criticality
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Self-Organized Criticality: Defined l Self-Organized Criticality can be considered as a characteristic state of criticality which is formed by self-organization in a long transient period at the border of stability and chaos
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Characteristics l Open dissipative systems l The components in the system are governed by simple rules
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Characteristics (continued) l Thresholds exists within the system l Pressure builds in the system until it exceeds threshold
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Characteristics (Continued) l Naturally Progresses towards critical state l Small agitations in system can lead to system effects called avalanches l This happens regardless of the initial state of the system
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Domino Effect: System wide events l The same perturbation may lead to small avalanches up to system wide avalanches
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Example: Domino Effect By: Bak [1]
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Characteristics (continued) l Power Law l Events in the system follow a simple power law
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Power Law: graphed i) ii)
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This note was uploaded on 08/12/2008 for the course PSY 341K taught by Professor Gilden during the Spring '08 term at University of Texas at Austin.

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soc - Self-Organized Criticality (SOC) Tino Duong...

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