Figure 2From: To what extent is the bipolar rheoencephalographic signal contaminated by scalp blood flow? A clinical study to quantify its extra and non-extracranial components Example of REG I and PPG signals. Typical plethysmographical signals recorded from a subject (#19) before (A), during (B) and after (C) cuff inflation. Each board shows REG I and the sum of the PPG signals.Back to article page