Figure 4.

For a representative subject, κ score vs (a) ICA rank (variance explained), and (b) rank by κ (κ spectrum). The κ spectrum, is an L-curve with two distinct regimes: high κ (κ >20) and low κ (κ <20), with low κ components on a linear tail. (c) κ spectra for 8 subjects. (d) First 12 ME-ICA components ranked by κ for a representative subject. Each panel shows the time course and thresholded ΔR₂* map. Components are annotated with κ-score, ρ-score, and ICA component number. All high κ components are clearly functional networks.