Tavakolan2017 — Three-class upper extremity motor imagery EEG dataset (re-hosted from Dryad)

Re-hosted EEG data from Tavakolan et al. (2017), originally deposited on Dryad (DOI: 10.5061/dryad.6qs86) under a CC0 public domain dedication. Repackaged into per-subject ZIP archives for easier programmatic access.

Paper

M. Tavakolan, Z. Frehlick, X. Yong, and C. Menon, “Classifying three imaginary states of the same upper extremity using time-domain features,” PLoS ONE, vol. 12, no. 3, e0174161, 2017.
DOI: 10.1371/journal.pone.0174161

Paradigm

Three-class motor imagery of the same upper extremity (right arm):

A fourth class (Reach-Hold the Glass, StimulusCode 4) was also recorded but excluded from the paper’s analysis. It is included in the raw data.

Each trial: 3 s visual cue (imagery period), followed by a 4–6 s rest interval. 20 trials per class per session.

Participants

• 12 healthy right-handed subjects
• 4 sessions per subject on separate days
• Total: 48 recordings (12 subjects × 4 sessions)

Recording setup

File structure

12 per-subject ZIP files (P01.zip–P12.zip). Each contains 4 session ZIPs, each holding one BCI2000 .DAT file:

P01.zip
  P01_Se01.zip  →  BCI2000 .DAT (session 1)
  P01_Se02.zip  →  BCI2000 .DAT (session 2)
  P01_Se03.zip  →  BCI2000 .DAT (session 3)
  P01_Se04.zip  →  BCI2000 .DAT (session 4)
...
P12.zip

The BCI2000 .DAT files contain 280 source channels; only the first 32 are EEG. Channel gain: 0.0238419 μV per raw ADC unit. Events are in the StimulusCode state variable.

Reading the data

pip install BCI2kReader

from moabb.datasets import Tavakolan2017
from moabb.paradigms import MotorImagery

dataset = Tavakolan2017()
paradigm = MotorImagery(
    events=["rest", "right_hand", "right_elbow_flexion"],
    n_classes=3,
)
X, y, metadata = paradigm.get_data(dataset=dataset)

Re-hosting rationale

The original Dryad deposit requires OAuth API credentials for programmatic download, which creates a barrier for automated benchmarking pipelines. This Zenodo re-host provides direct URL access. The data is identical to the Dryad deposit — no modifications were made.

License

CC0 1.0 Universal (Public Domain Dedication), as per the original Dryad deposit.