Figure 4. .

V1 retinotopic activation maps in response to the low-SF stimulus at 80% contrast. A) The stimulus, here compressed to show over a larger spatial extent, and so SF appears higher than in the actual stimulus, shown in Figure 2. B) Unmodified GCAL model after 20,000 iterations (mean activation = 0.029; max. = 0.512). C) The best fitting model for chronic schizophrenia data (mean = 0.007; max. = 0.386). D) The best fitting model for FES data (mean = 0.041, max. = 0.540). Greater activation is indicated by increased brightness. Reduced activation to the low-SF stimulus can be seen in C, the chronic schizophrenia model. Increased activation to the same stimulus can be seen in D, in the FES model. These changes, relative to the unmodified model (B), and differences from each other are consistent with published data on CS in these groups.