Abstract:
:The default-mode network (DMN) is a set of specific brain regions whose activity, predominant in the resting-state, is attenuated during cognitively demanding, externally-cued tasks. The cognitive correlates of this network have proven difficult to interrogate, but one hypothesis is that regions in the network process episodic memories and semantic knowledge integral to internally-generated mental activity. Here, we compare default-mode functional connectivity in the same group of subjects during rest and conscious sedation with midazolam, a state characterized by anterograde amnesia and a reduced level of consciousness. Although the DMN showed functional connectivity during both rest and conscious sedation, a direct comparison found that there was significantly reduced functional connectivity in the posterior cingulate cortex during conscious sedation. These results confirm that low-frequency oscillations in the DMN persist and remain highly correlated even at reduced levels of consciousness. We hypothesize that focal reductions in DMN connectivity, as shown here in the posterior cingulate cortex, may represent a stable correlate of reduced consciousness.
journal_name
Hum Brain Mappjournal_title
Human brain mappingauthors
Greicius MD,Kiviniemi V,Tervonen O,Vainionpää V,Alahuhta S,Reiss AL,Menon Vdoi
10.1002/hbm.20537subject
Has Abstractpub_date
2008-07-01 00:00:00pages
839-47issue
7eissn
1065-9471issn
1097-0193journal_volume
29pub_type
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