Why doesn’t “_data” change after I do a rereference to eeg
raw_re.set_eeg_reference(ref_channels="average", projection=True)
Because you are setting projection=True. Thus, the common average reference is added as a projector in raw.info["projs"] instead of being directly applied to the underlying data array.
Either set projection=False or call raw.apply_proj() to apply the projectors.
Mathieu
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Thank u！！！！！！
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