mne.time_frequency.psd_welch¶

mne.time_frequency.
psd_welch
(inst, fmin=0, fmax=inf, tmin=None, tmax=None, n_fft=256, n_overlap=0, n_per_seg=None, picks=None, proj=False, n_jobs=1, reject_by_annotation=True, verbose=None)[source]¶ Compute the power spectral density (PSD) using Welch’s method.
Calculates periodograms for a sliding window over the time dimension, then averages them together for each channel/epoch.
 Parameters
 instinstance of
Epochs
orRaw
orEvoked
The data for PSD calculation
 fmin
float
Min frequency of interest
 fmax
float
Max frequency of interest
 tmin
float
None
Min time of interest
 tmax
float
None
Max time of interest
 n_fft
int
The length of FFT used, must be
>= n_per_seg
(default: 256). The segments will be zeropadded ifn_fft > n_per_seg
. If n_per_seg is None, n_fft must be <= number of time points in the data. n_overlap
int
The number of points of overlap between segments. Will be adjusted to be <= n_per_seg. The default value is 0.
 n_per_seg
int
None
Length of each Welch segment (windowed with a Hamming window). Defaults to None, which sets n_per_seg equal to n_fft.
 picks
str
list
slice
None
Channels to include. Slices and lists of integers will be interpreted as channel indices. In lists, channel type strings (e.g.,
['meg', 'eeg']
) will pick channels of those types, channel name strings (e.g.,['MEG0111', 'MEG2623']
will pick the given channels. Can also be the string values “all” to pick all channels, or “data” to pick data channels. None (default) will pick good data channels(excluding reference MEG channels). projbool
Apply SSP projection vectors. If inst is ndarray this is not used.
 n_jobs
int
Number of CPUs to use in the computation.
 reject_by_annotationbool
Whether to omit bad segments from the data while computing the PSD. If True, annotated segments with a description that starts with ‘bad’ are omitted. Has no effect if
inst
is an Epochs or Evoked object. Defaults to True.New in version 0.15.0.
 verbosebool,
str
,int
, orNone
If not None, override default verbose level (see
mne.verbose()
and Logging documentation for more).
 instinstance of
 Returns
Notes
New in version 0.12.0.