This dataset contains 12-class joint frequency-phase modulated steady-state visual evoked potentials (SSVEPs) acquired from 10 subjects used to estimate an online performance of brain-computer interface (BCI) in the reference study (Nakanishi et al., 2015).
Each .mat file has a four-way tensor electroencephalogram (EEG) data for each subject.
Please see the reference paper for the detail.
[Number of targets, Number of channels, Number of sampling points, Number of trials] = size(eeg)
- Number of targets : 12
- Number of channels : 8
- Number of sampling points : 1114
- Number of trials : 15
- Sampling rate [Hz] : 256
The order of the stimulus frequencies in the EEG data:
[9.25, 11.25, 13.25, 9.75, 11.75, 13.75, 10.25, 12.25, 14.25, 10.75, 12.75, 14.75] Hz
(e.g., eeg(1,:,:,:) and eeg(5,:,:,:) are the EEG data while a subject was gazing at the visual stimuli flickering at 9.25 Hz and 11.75Hz, respectively.)
The onset of visual stimulation is at 39th sample point, which means there are redundant data for 0.15 [s] before stimulus onset.
- Masaki Nakanishi, Yijun Wang, Yu-Te Wang and Tzyy-Ping Jung, "A Comparison Study of Canonical Correlation Analysis Based Methods for Detecting Steady-State Visual Evoked Potentials," PLoS One, vol.10, no.10, e140703, 2015. http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0140703