plot_psd: Plot Power Spectral Density

In neuroconductor-devel-releases/eegUtils: A collection of utilities for EEG analysis

Description

Calculate and plot the PSD for eeg_* objects. Output units are dB. The PSD is calculated using Welch's method.

Usage

plot_psd(data, freq_range = NULL, ...)

## S3 method for class 'eeg_epochs'
plot_psd(data, freq_range = NULL, n_fft = 512,
  seg_length = NULL, noverlap = NULL, ...)

## S3 method for class 'eeg_data'
plot_psd(data, freq_range = NULL, n_fft = 2048,
  noverlap = NULL, seg_length = NULL, ...)

## S3 method for class 'eeg_ICA'
plot_psd(data, freq_range = NULL, components = NULL,
  seg_length = NULL, noverlap = NULL, n_fft = 512, ...)

## S3 method for class 'data.frame'
plot_psd(data, freq_range = NULL, ...)

Arguments

data	Object of class eeg_epochs, eeg_data, or eeg_ICA.
freq_range	Vector of lower and upper frequencies to plot. (e.g. c(1, 40))
...	Additional parameters.
n_fft	Number of points to use for the underlying FFTs. Defaults to 512 for eeg_epochs or minimum of 2048 or the signal length for eeg_data.
seg_length	Length of individual segments. Defaults to n_fft. Must be <= n_fft.
noverlap	Amount of overlap between segments, in sampling points. Defaults to 50%.
components	Which components to compute the PSD for. Defaults to all.

Details

Welch's method splits the data into multiple segments and then averages over those segments. For epoched data, Welch's FFT is calculated separately for each trial.

Specific parameters such as the number of FFT points and the amount of overlap between segments can be passed to Welch's FFT

Methods (by class)

• eeg_epochs: Plot PSD for eeg_epochs.

• eeg_data: Plot PSD for eeg_data.

• eeg_ICA: Plot PSD for eeg_ICA objects

• data.frame: Plot PSD for data.frames.

Author(s)

Matt Craddock, [e-mail]

Examples

 plot_psd(demo_epochs)
 plot_psd(demo_epochs, seg_length = 256)

neuroconductor-devel-releases/eegUtils documentation built on May 5, 2020, 3:49 a.m.