Supplementary Figure 2: Comparison of two methods for measuring respiration.
From: Broadly tuned and respiration-independent inhibition in the olfactory bulb of awake mice
(a) Example raw traces from simultaneous respiratory recordings using a nasally implanted thermocouple (red) and a foil strain gauge (black). We observed that the peak of the strain gauge signal closely matched the point of maximum rate of change for the thermocouple signal. (b) Cross correlation of the two signals shows a lag of 68 ms for the thermocouple relative to the strain gauge. Mean and s.d. time between peaks was 67 +/- 5 ms (c) Comparison of the strain gauge with the differentiated thermocouple signal shows a good match of the signal peaks. (d) Cross correlation of the two signals in (d) shows a greatly reduced lag of 15 ms for the strain gauge relative to the thermocouple. Mean and s.d. time between peaks was 0 +/- 7 ms.
