Wandering minds: the default network and stimulus-independent thought.
Level 4 - case-series / case-control
Cross-sectional neuroimaging and self-report study (graded by non-clinical design analogy).
PubMed 17234951 · doi:10.1126/science.1131295
What was done
The authors combined thought-sampling techniques with functional brain imaging to evaluate the neural substrates of stimulus-independent thought (mind-wandering). They evaluated brain activity during states of mind-wandering and correlated individual self-reported mind-wandering frequency with activity in cortical regions typically active during rest.
What was found
The abstract reports no quantitative values, sample sizes, effect sizes, or test statistics. Qualitatively, mind-wandering was found to be associated with activity within the cortical default network, and individual variation in reported mind-wandering tendencies correlated with activity levels in this network.
Why it matters
This work links spontaneous, stimulus-independent mental activity to the brain's baseline default network, establishing an empirical neural basis for everyday mind-wandering.
Limits
The abstract omits sample size, participant demographics, specific imaging modalities, task design parameters, and quantitative metrics. The correlational design cannot establish whether default network activation causally drives or merely correlates with mind-wandering episodes.
Cited by
- supports When people are instructed in an fMRI to think about nothing, their mind wanders and the default mode network becomes active.