Dimensionality reduction impedes the extraction of dynamic functional connectivity states from fMRI recordings of resting wakefulness

- Limitations and potential confounds of dimensionality reduction in extracting dFC states from fMRI recordings are evaluated.
- It is shown that the decorrelating actions of principal component analysis can lead to spurious FC state dynamics.
- This limitation is characterized by analyzing the composition and occupancy of FC states in positive and negative controls.
- Accounting for this limitation, two interpretable FC states are extracted during resting wakefulness.

BackgroundResting wakefulness is not a unitary state, with evidence accumulating that spontaneous reorganization of brain activity can be assayed through functional magnetic resonance imaging (fMRI). The dynamics of correlated fMRI signals among functionally-related brain regions, termed dynamic functional connectivity (dFC), may represent nonstationarity arising from underlying neural processes. However, given the dimensionality and noise inherent in such recordings, seeming fluctuations in dFC could be due to sampling variability or artifacts.New methodHere, we highlight key methodological considerations when evaluating dFC in resting-state fMRI data.Comparison with existing methodIn particular, we demonstrate how dimensionality reduction of fMRI data, a common practice often involving principal component analysis, may give rise to spurious dFC phenomenology due to its effect of decorrelating the underlying time-series.ConclusionWe formalize a dFC assessment that avoids dimensionality reduction and use it to show the existence of at least two FC states in the resting-state.