Reading XDF EEG data

Here we read some sample XDF data. Although we do not analyze it here, this recording is of a short parallel auditory response (pABR) experiment 1 and was provided by the Maddox Lab.

# Authors: Clemens Brunner <clemens.brunner@gmail.com>
#          Eric Larson <larson.eric.d@gmail.com>
#
# License: BSD-3-Clause

import os.path as op

import pyxdf

import mne
from mne.datasets import misc

fname = op.join(
    misc.data_path(), 'xdf',
    'sub-P001_ses-S004_task-Default_run-001_eeg_a2.xdf')
streams, header = pyxdf.load_xdf(fname)
data = streams[0]["time_series"].T
assert data.shape[0] == 5  # four raw EEG plus one stim channel
data[:4:2] -= data[1:4:2]  # subtract (rereference) to get two bipolar EEG
data = data[::2]  # subselect
data[:2] *= (1e-6 / 50 / 2)  # uV -> V and preamp gain
sfreq = float(streams[0]["info"]["nominal_srate"][0])
info = mne.create_info(3, sfreq, ["eeg", "eeg", "stim"])
raw = mne.io.RawArray(data, info)
raw.plot(scalings=dict(eeg=100e-6), duration=1, start=14)

Out:

Creating RawArray with float64 data, n_channels=3, n_times=2320128
    Range : 0 ... 2320127 =      0.000 ...   232.013 secs
Ready.

References

1

Melissa J. Polonenko and Ross K. Maddox. The Parallel Auditory Brainstem Response. Trends in Hearing, 23:2331216519871395, 2019. doi:10.1177/2331216519871395.

Estimated memory usage: 134 MB

previous

Reading/Writing a noise covariance matrix

next

Generate simulated evoked data