Figure 6.

Components within Clusters. Individual components assigned to each centroid (black) are depicted separately for each group (HRA and LRC) and condition (neutral and smiling). Oxy-hemoglobin (HbO) components are shown in red (HRA) and pink (LRC), while deoxy-hemoglobin components (HbD) are shown in blue (HRA) and cyan (LRC). The spatial assignment by laterality index is indicated as “frontal,” “lateral,” or “mixed” for each cluster, and numeric differences in mean normalized weight across regions are given (Frontal-Lateral).