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Role of the default mode network in cognitive transitions

Published version
Peer-reviewed

Type

Article

Change log

Authors

Smith, VHL 
Mitchell, Daniel 

Abstract

A frequently repeated finding is that the default mode network (DMN) shows activa-tion decreases during externally-focused tasks. This finding has led to an emphasis in DMN research on internally-focused self-relevant thought processes. A recent study, in contrast, implicates the DMN in substantial externally-focused task switch-es. Using functional magnetic resonance imaging, we scanned 24 participants per-forming a task switch experiment. Whilst replicating previous DMN task switch ef-fects, we also found large DMN increases for brief rests as well as task restarts after rest. Our findings are difficult to explain using theories strictly linked to internal or self-directed cognition. In line with principal results from the literature, we suggest that the DMN encodes scene, episode or context, by integrating spatial, self-referential and temporal information. Context representations are strong at rest, but re-reference to context also occurs at major cognitive transitions.

Description

Keywords

cognitive control, fMRI, task switching

Journal Title

Cerebral Cortex

Conference Name

Journal ISSN

1460-2199
1460-2199

Volume Title

28

Publisher

OUP
Sponsorship
MRC (1650197)
MRC (unknown)
Medical Research Council (MC_UU_00005/6)