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2.4. Mean low-frequency amplitude calculation

KX Kaijun Xu
RL Rui Liu
XC Xipeng Chen
XC Xi Chen
YY Yong Yang
QW Quanchuan Wang
JY Jiazhong Yang
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Amplitude of low frequency fluctuation calculation was performed based on the pre-processed data. The power spectrum was obtained by transforming the time series of each voxel into the frequency domain through a Fourier transform, and the ALFF value was obtained by the square root of the pre-set frequency domain. To eliminate the difference in the overall level of ALFF between individuals, the ALFF value of each voxel was divided by the mean ALFF value of the whole brain, and each voxel in the whole brain was standardized in turn to obtain the mean ALFF, namely, mALFF. The mALFF values of the flight group and the control group in the slow-5 frequency band (0.01∼0.027 Hz) and slow-4 frequency band (0.027∼0.073 Hz) were calculated for statistical analysis.

Copyright and License information:  ©2023 Xu, Liu, Chen, Chen, Yang, Wang and Yang.
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