Figure 4

Across-subject reproducibility of the effect of flutter stimulus amplitude on the power spectra of the data sampled in the A-P dimension. A: Average periodograms of the OIS responses of 5 subjects to 5 different stimulus amplitudes. B: Average relative power in the 6–9.5 cycles/mm and 1.5–3 cycles/mm frequency bands plotted as a function of the stimulus amplitude. As the stimulus amplitude increases, the spectral power shifts progressively to lower spatial frequencies.