Extrinsic and Intrinsic Systems in the Posterior Cortex of the Human Brain Revealed during Natural Sensory Stimulation (original) (raw)

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Yulia Golland ,

1Department of Psychology, Hebrew University of Jerusalem, Jerusalem, Israel

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Shlomo Bentin ,

1Department of Psychology, Hebrew University of Jerusalem, Jerusalem, Israel

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Hagar Gelbard ,

2Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel

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Yoav Benjamini ,

3Department of Statistics and Operations Research, Tel-Aviv University, Tel-Aviv, Israel

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Ruth Heller ,

3Department of Statistics and Operations Research, Tel-Aviv University, Tel-Aviv, Israel

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Yuval Nir ,

2Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel

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Uri Hasson ,

4Centre for Neural Science, New York University, New York, USA

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Rafael Malach

2Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel

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Yulia Golland, Shlomo Bentin, Hagar Gelbard, Yoav Benjamini, Ruth Heller, Yuval Nir, Uri Hasson, Rafael Malach, Extrinsic and Intrinsic Systems in the Posterior Cortex of the Human Brain Revealed during Natural Sensory Stimulation, Cerebral Cortex, Volume 17, Issue 4, April 2007, Pages 766–777, https://doi.org/10.1093/cercor/bhk030
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Abstract

When exposing subjects to a continuous segment of an audiovisual movie, a large expanse of human cortex, especially in the posterior half of the cerebral cortex, shows stimulus-driven activity. However, embedded within this widespread activity, there are cortical regions whose activity is dissociated from the external stimulation. These regions are intercorrelated among themselves, forming a functional network, which largely overlaps with cortical areas previously shown to be deactivated by task-oriented paradigms. Moreover, the network of areas whose neuronal dynamics are associated with external inputs and the network of areas that appears to be intrinsically driven complement each other, providing coverage of most of the posterior cortex. Thus, we propose that naturalistic stimuli reveal a fundamental neuroanatomical partition of the human posterior cortex into 2 global networks: an “extrinsic” system, comprising areas associated with the processing of external inputs, and an “intrinsic” system, largely overlapping with the task-negative, default-mode network, comprising areas associated with—as yet not fully understood—intrinsically oriented functions.

© The Author 2006. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: [email protected]

Topic:

• cerebral cortex
• complement system proteins
• seeds
• time factors
• brain
• maps
• voxel

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