Evaluating OPM MEG Performance

The normality and consistency of the MEG data were checked with the Kolmogorov–Smirnov test [32 (link)]. The performance of OPM MEG compared with SQUID MEG was assessed using precision, recall, and the F-measure [33 (link)] and by using the successful detection of brain responses during finger tapping. Comparisons of measured signals and parameters (e.g., amplitude of waveforms, SNR) between OPMs vs. SGs were performed using the Student’s T-test. Bonferroni correction was applied for multiple comparisons. The significance level was set at p < 0.05. All statistical analyses were performed in the R 3.6.1 and SPSS software package version 22.0.0.0 (Armonk, NY, USA: IBM Corp).