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Damage to the salience network and interactions with the default mode network
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Jilka, Sagar, Scott, G., Ham, T., Pickering, A., Bonnelle, V., Braga, R. M., Leech, R. and Sharp, D. J. (2014) Damage to the salience network and interactions with the default mode network. Journal of Neuroscience, 34 (33). pp. 10798-10807. doi:10.1523/JNEUROSCI.0518-14.2014 ISSN 0270-6474.
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Official URL: http://dx.doi.org/10.1523/JNEUROSCI.0518-14.2014
Abstract
Interactions between the Salience Network (SN) and the Default Mode Network (DMN) are thought to be important for cognitive control. However, evidence for a causal relationship between the networks is limited. Previously, we have reported that traumatic damage to white matter tracts within the SN predicts abnormal DMN function. Here we investigate the effect of this damage on network interactions that accompany changing motor control. We initially used fMRI of the Stop Signal Task to study response inhibition in humans. In healthy subjects, functional connectivity (FC) between the right anterior insula (rAI), a key node of the SN, and the DMN transiently increased during stopping. This change in FC was not seen in a group of traumatic brain injury (TBI) patients with impaired cognitive control. Furthermore, the amount of SN tract damage negatively correlated with FC between the networks. We confirmed these findings in a second group of TBI patients. Here, switching rather than inhibiting a motor response: (1) was accompanied by a similar increase in network FC in healthy controls; (2) was not seen in TBI patients; and (3) tract damage after TBI again correlated with FC breakdown. This shows that coupling between the rAI and DMN increases with cognitive control and that damage within the SN impairs this dynamic network interaction. This work provides compelling evidence for a model of cognitive control where the SN is involved in the attentional capture of salient external stimuli and signals the DMN to reduce its activity when attention is externally focused.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School > Health Sciences Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School |
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Journal or Publication Title: | Journal of Neuroscience | ||||||
Publisher: | Society for Neuroscience | ||||||
ISSN: | 0270-6474 | ||||||
Official Date: | 13 August 2014 | ||||||
Dates: |
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Volume: | 34 | ||||||
Number: | 33 | ||||||
Page Range: | pp. 10798-10807 | ||||||
DOI: | 10.1523/JNEUROSCI.0518-14.2014 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) |
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