xcp_d.utils.restingstate.compute_alff

xcp_d.utils.restingstate.compute_alff(data_matrix, low_pass, high_pass, TR)[source]

Compute amplitude of low-frequency fluctuation (ALFF).

Parameters:

  • data_matrix (numpy.ndarray) – data matrix points by timepoints

  • low_pass (float) – low pass frequency in Hz

  • high_pass (float) – high pass frequency in Hz

  • TR (float) – repetition time in seconds

Returns:

alff – ALFF values.

Return type:

numpy.ndarray

Notes

Implementation based on https://pubmed.ncbi.nlm.nih.gov/16919409/.