Fig. 1From: Mild poikilocapnic hypoxia increases very low frequency haemoglobin oxygenation oscillations in prefrontal cortexWavelet transform of recorded signals: BP (a, e), HR/ECG (b, f), HbO2 RIGHT (c, g) and SASLEFT (d, h) for one of the volunteers. Left (right) columns of plots illustrate results for breathing a gas mixture with 19.8% (14.8%) O2Back to article page