README.md

---
license: pddl
tags:
- eeg
- medical
- clinical
- classification
- parkinson
---
# Cavanagh2018b: EEG Parkinson's Classification Dataset in Resting-State
The Cavanagh2018b dataset contains resting-state EEG recordings from the same group of people used in the Cavanagh2018a study. Participants included 28 individuals diagnosed with Parkinson's disease and 28 age- and sex-matched control participants. Each subject underwent a 2-minute resting-state EEG recording session with eyes open. These recordings were collected in a seated posture, prior to or following the auditory oddball task, under the same EEG setup (64-channel cap, 500 Hz sampling rate).

This dataset serves as a complementary baseline condition for evaluating spontaneous brain dynamics in Parkinson's disease. Though not central to the novelty task paradigm, resting-state data may be useful for investigations into low-frequency oscillations or non-task-based classification approaches of Parkinson's disease.
## Paper
Cavanagh, J. F., Kumar, P., Mueller, A. A., Richardson, S. P., & Mueen, A. (2018). **Diminished EEG habituation to novel events effectively classifies Parkinson's patients**. _Clinical Neurophysiology_, 129(2), 409-418.

DISCLAIMER: We (DISCO) are NOT the owners or creators of this dataset, but we merely uploaded it here, to support our's ("EEG-Bench") and other's work on EEG benchmarking.
## Dataset Structure
The `IMPORT_ME_REST.xlsx` file contains some information about the patients with PD (sex, age, medication status at first recording), as well as their matched control patients.
### Filename Format

```
[PID]_[SESSION]_PD_REST.mat
```
PID is the patient ID (e.g. `813`), while SESSION distinguishes different days of recording (can be `1` or `2` for patients with PD and is always `1` for patients without PD). All patients with PID <= 829 have Parkinson's Disease and all patients with PID >= 890 do NOT have Parkinson's Disease and hence belong to the control group.

### Fields in each File
A `.mat` file can be read in python as follows:
```python
from scipy.io import loadmat
filename = "813_2_PD_REST.mat"
mat = loadmat(filename, simplify_cells=True)
```
(A field "fieldname" can be read from `mat` as `mat["fieldname"]`.)

Then `mat` contains (among others) the following fields and subfields
- `EEG`
    - `data`: EEG data of shape `(#channels, time_len)`. E.g. a recording of 7 minutes with 67 channels and a sampling rate of 500 Hz will have shape `(67, 210000)`.
    - `event`: Contains a list of dictionaries, each entry (each event) having the following description:
        - `latency`: The onset of the event, measured as the index in the time-dimension `time_len`. The duration of each event is 1 second. Hence, with a 500 Hz sampling rate, the EEG data `event_data` corresponding to the `i`-th event would be
            ```
            start_index = mat["EEG"]["event"][i]["latency"]
            event_data = numpy.transpose(mat["EEG"]["data"], [1, 2]).reshape([#channels, #trials * trial_len])[:, start_index:start_index+500] # shape (#channels, 500)
            ```
        - `type`: The type of event. Can be `"S  1"` / `"S  2"` (patient has eyes open), or `"S  3"` / `"S  4"` (patient has eyes closed).
    - `chanlocs`: A list of channel descriptors
    - `nbchan`: Number of channels
    - `srate`: Sampling Rate (Hz)

## License
By the original authors of this work, this work has been licensed under the PDDL v1.0 license (see LICENSE.txt).