Table 2. Temporal and spectral features of dynamic functional connectivity.
Features and abbreviations are shown. dFC, dynamic functional connectivity.
| Abbreviation | Feature | Interpretation |
|---|---|---|
| ALFF-dFC | Amplitude of Low Frequency Fluctuations in dFC | Energy of dFC power spectrum in low-frequency range (0.01-0.08 Hz) |
| CREST | Spectral Crest | Peakiness of dFC power spectrum |
| FLAT | Spectral Flatness | Noisiness of dFC power spectrum |
| FLUX | Spectral Flux | Rate of change of dFC power spectrum |
| KURT | Spectral Kurtosis | Kurtosis of dFC power spectrum |
| MV | Mean Value | Average magnitude of dFC |
| PAV | Proportion of Anticorrelated Volumes | Proportion of time points for which dFC is negative |
| PEAK | Dominant Frequency | Most prominent frequency in dFC |
| PSE | Power Spectral Entropy | Entropy of dFC power spectrum |
| SCO | Spectral Centroid | Center of mass of dFC power spectrum |
| SLOPE | Spectral Slope | Rate of change of dFC power spectrum toward higher frequencies |
| SMED | Median Frequency | Median frequency of dFC power spectrum |
| SKW | Spectral Skewness | Skewness of dFC power spectrum |
| SPR | Spectral Spread | Measure of bandwidth of dFC power spectrum |
| SRO | Spectral Rolloff | Right-skewness of dFC power spectrum |
| VAR | Variance | Variance of dFC fluctuations |
| ZC | Zero-Crossing Rate | Rate at which dFC changes signs |