Reference : Neural Correlates of Ongoing Conscious Experience: Both Task-Unrelatedness and Stimul...
Scientific journals : Article
Social & behavioral sciences, psychology : Neurosciences & behavior
Social & behavioral sciences, psychology : Theoretical & cognitive psychology
http://hdl.handle.net/2268/89410
Neural Correlates of Ongoing Conscious Experience: Both Task-Unrelatedness and Stimulus-Independence Are Related to Default Network Activity
English
Stawarczyk, David mailto [Université de Liège - ULg > Département des sciences cognitives > Psychopathologie cognitive >]
Majerus, Steve mailto [Université de Liège - ULg > Département des sciences cognitives > Psychopathologie cognitive >]
Maquet, Pierre mailto [Centre Hospitalier Universitaire de Liège - CHU > > Neurologie Sart Tilman >]
D'Argembeau, Arnaud mailto [Université de Liège - ULg > Département des sciences cognitives > Psychopathologie cognitive >]
2011
PLoS ONE
Public Library of Science
6
2
e16997
Yes (verified by ORBi)
International
1932-6203
San Franscisco
CA
[en] The default mode network (DMN) is a set of brain regions that consistently shows higher activity at rest compared to tasks requiring sustained focused attention toward externally presented stimuli. The cognitive processes that the DMN possibly underlies remain a matter of debate. It has alternately been proposed that DMN activity reflects unfocused attention toward external stimuli or the occurrence of internally generated thoughts. The present study aimed at clarifying this issue by investigating the neural correlates of the various kinds of conscious experiences that can occur during task performance. Four classes of conscious experiences (i.e., being fully focused on the task, distractions by irrelevant sensations/perceptions, interfering thoughts related to the appraisal of the task, and mind-wandering) that varied along two dimensions (“task-relatedness” and “stimulus-dependency”) were sampled using thought-probes while the participants performed a go/no-go task. Analyses performed on the intervals preceding each probe according to the reported subjective experience revealed that both dimensions are relevant to explain activity in several regions of the DMN, namely the medial prefrontal cortex, posterior cingulate cortex/precuneus, and posterior inferior parietal lobe. Notably, an additive effect of the two dimensions was demonstrated for midline DMN regions. On the other hand, lateral temporal regions (also part of the DMN) were specifically related to stimulus-independent reports. These results suggest that midline DMN regions underlie cognitive processes that are active during both internal thoughts and external unfocused attention. They also strengthen the view that the DMN can be fractionated into different subcomponents and reveal the necessity to consider both the stimulus-dependent and the task-related dimensions of conscious experiences when studying the possible functional roles of the DMN.
Centre de Recherches du Cyclotron - CRC
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
http://hdl.handle.net/2268/89410
10.1371/journal.pone.0016997
http://dx.plos.org/ambra-doi-resolver/10.1371/journal.pone.0016997

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