Enhancement of δ band and α rhythm degradation during tumor growth. Normalized relative power in glioma-bearing and sham mice of the standard neurophysiological spectral bands (A) and of δ band in detail (B). The histograms show the difference in relative power of the different spectral bands of the 2 last recording sessions with respect to the baseline (first 3 days of recordings). The mean ± sem is shown for each group. (Student’s t-test, **P < .007).