Default mode network can support the level of detail in experience during active task states

Proceedings of the National Academy of Sciences of the United States of America
Mladen SormazJonathan Smallwood

Abstract

Regions of transmodal cortex, in particular the default mode network (DMN), have historically been argued to serve functions unrelated to task performance, in part because of associations with naturally occurring periods of off-task thought. In contrast, contemporary views of the DMN suggest it plays an integrative role in cognition that emerges from its location at the top of a cortical hierarchy and its relative isolation from systems directly involved in perception and action. The combination of these topographical features may allow the DMN to support abstract representations derived from lower levels in the hierarchy and so reflect the broader cognitive landscape. To investigate these contrasting views of DMN function, we sampled experience as participants performed tasks varying in their working-memory load while inside an fMRI scanner. We used self-report data to establish dimensions of thought that describe levels of detail, the relationship to a task, the modality of thought, and its emotional qualities. We used representational similarity analysis to examine correspondences between patterns of neural activity and each dimension of thought. Our results were inconsistent with a task-negative view of DMN function. Distin...Continue Reading

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Methods Mentioned

BETA
RSA
PCA

Software Mentioned

FMRIB Library FSL
FMRIB
RSA
pyMVPA
SPSS
FEAT
BET
FMRI
MCFLIRT

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