Figure 4 Activation differences are shown between patients with predominantly positive symptoms of schizophrenia (PSZ) and those with predominantly negative symptoms of schizophrenia (NSZ) during the verbal fluency task (VFT). The left panel displays a 2D representation of the activation patterns across multiple channels, with warmer colors (red and orange) indicating higher activation and cooler colors (blue) indicating lower activation. The right panel provides a 3D visualization of the brain, highlighting the specific regions of activation. Channels Ch21 and Ch51 exhibited significant activation differences between the 2 groups, with higher activation observed in the PSZ group. These channels survived FDR correction, indicating robust activation differences. The color bar on the right indicates the scale of activation values, with higher values corresponding to greater activation. This figure highlights the distinct activation patterns in the prefrontal cortex (PFC) between patients with PSZ and NSZ during the VFT.