Power spectra analysis during the three experimental conditions.

<p>Variation of power spectra at baseline, during the IOP experiment and after heart arrest, for velocity of retinal artery (black lines) and optic nerve head (gray lines). Each period of the experiment is represented by the corresponding mean power spectrum: baseline (solid line), increased IOP at 150 mmHg (dashed line) and after heart arrest (dotted line). Upper right corner of the figure represents zoomed power spectra between 0 and 1000 Hz (gray area).