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Plos One : Changes in Effective Connectivity by Propofol Sedation, Volume 8

By Zang, Yu-feng

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Book Id: WPLBN0003945056
Format Type: PDF eBook :
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Reproduction Date: 2015

Title: Plos One : Changes in Effective Connectivity by Propofol Sedation, Volume 8  
Author: Zang, Yu-feng
Volume: Volume 8
Language: English
Subject: Journals, Science, Medical Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary)
Historic
Publication Date:
Publisher: Plos

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Zang, Y. (n.d.). Plos One : Changes in Effective Connectivity by Propofol Sedation, Volume 8. Retrieved from http://netlibrary.net/


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Description : Mechanisms of propofol-induced loss of consciousness remain poorly understood. Recent fMRI studies have shown decreases in functional connectivity during unconsciousness induced by this anesthetic agent. Functional connectivity does not provide information of directional changes in the dynamics observed during unconsciousness. The aim of the present study was to investigate, in healthy humans during an auditory task, the changes in effective connectivity resulting from propofol induced loss of consciousness. We used Dynamic Causal Modeling for fMRI (fMRI-DCM) to assess how causal connectivity is influenced by the anesthetic agent in the auditory system. Our results suggest that the dynamic observed in the auditory system during unconsciousness induced by propofol, can result in a mixture of two effects : a local inhibitory connectivity increase and a decrease in the effective connectivity in sensory cortices.

 

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