Figure 2
From: Lateral inhibition in visual cortex of migraine patients between attacks
Steady-state waveforms are converted into the frequency domain by Discrete Fourier Transformation in order to measure the amplitude at the first harmonic (4Hz, 1H) in the windmill-dartboard (W- D) stimulation, and of the second harmonic (8Hz, 2H) in both the windmill-dartboard and partial-windmill (W- D) stimulations. To assess long-range lateral interactions, we calculated attenuation of the 2nd harmonic component in the W-D respective to the P-W pattern.