**3.7 Theta-beta ratio for the subject with the lowest exam score**

As for the subject with the highest exam score, the theta and beta voltages in this subject with the lowest exam score also resulted in larger increases in beta than in theta voltage, thereby decreasing the theta-beta ratio (TBR) by 16.1%, from 1.55 to 1.30. This range of TBR indicate that the subject with the lowest exam score is functioning with 30%–55% more theta than beta bandwidth voltage.
