Figure 3
Schema illustrating the recording of pattern-reversal visual evoked potentials (P-VEPs) from the right eye fixating the red cross (left from the checkerboard) in patient #8. Such was the way the crossed fibers were examined. Active electrodes (O1, Oz and O2) and the reference electrode (Fz) were placed according to the 10–20 electroencephalographic system. The different waveforms represent preoperative (red line) and different postoperative (at 1 week, 3 months and 6 months) P-VEPs in O2–FZ derivation (the paradoxical lateralization taken into consideration) (a). Distribution of the P100 amplitude in P-VEPs between patients with the grade of compression 0–1 and 2–4. The grade was not a significant factor (p = 0.195). For the description of the boxplot parameters, see the legend of Fig. 1b (b).
