Description
This preprocessed EEG dataset is extracted from tutorial available here:
ftp://sccn.ucsd.edu/pub/PDF_EEGLAB_Wiki_Tutorial.pdf
Dataset for this tutorial is available here:
http://sccn.ucsd.edu/eeglab/download/eeglab_data.set
Resulting ERP waves are shown on pages 28-30 (3D scalp not available).
The data which you are interested in to plot is in EEG.data member. Dimensions are channels(32) x samples(384) x trials (80). So we have 80 realizations of some random process (brain reaction for target visual stimulus) recorded at 32 different scalp locations.
EEG.times contains a time vector common for all trials. Zero is the time instant of presenting stimulus.
EEG.comments contains some info about experiment itself:
"During this selective visual attention experiment, stimuli appeared briefly in any of five squares arrayed horizontally above a central fixation cross. In each experimental block, one (target) box was differently colored from the rest Whenever a square appeared in the target box the subject was asked to respond quickly with a right thumb button press. If the stimulus was a circular disk, he was asked to ignore it. (Reference: Makeig et al.. J. Neurosci. 19:2665-80, 1999)
These data were constructed by concatenating three-second epochs from one subject, each containing a target square in the attended location ('square' events, left-hemifield locations 1 or 2 only) followed by a button response ('rt' events). The data were stored in continuous data format to illustrate the process of epoch extraction from continuous data."
ERP images
RP & FSD
Recurrence plot and example of FSD plot for randomly generated Gaussian centers.
ERP data was normalized.
