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. Author manuscript; available in PMC: 2013 Jul 1.
Published in final edited form as: Physiol Meas. 2012 Jun 27;33(7):1171–1179. doi: 10.1088/0967-3334/33/7/1171

Figure 4.

Figure 4

Correlation between gastric slow wave frequencies recorded by mucosal electrodes (EMG) to those recorded by (a) SQUID magnetometer (MGG), (b) cutaneous electrodes (EGG), (c) SOBI-MGG, and (d) SOBI-EGG. Data points represent peaks detected in FFT of 9 samples of magnetic and electric data. The peak frequencies determined by mucosal electrodes and SQUID are strongly correlated (correlation coefficient, r = 0.97 for EMG/MGG, r = 0.99 for EMG/SOBI- MGG) than between mucosal and cutaneous electrodes (r = 0.93 for EMG/EGG, r = 0.95 for EMG/SOBI- EGG). A linear fit to the data is also shown to emphasize the degree of correlation.