Figure 4

PCA brain mappings (P ₁ , P ₂ , P ₃ ) associated with clinical history reading (CH), X-ray analysis (XR) and diagnostic decision-making (DG). The normalized loadings for each PCA factor greater than 0.5 in Table 2 were color-coded from yellow to dark-blue to generate the brain maps. The dark-blue areas depicted the electrodes where entropy H(e _i ) was heavily loaded in the corresponding factor.