---
pretty_name: "Penn Electrophysiology of Encoding and Retrieval Study (PEERS)"
license: cc0-1.0
tags:
  - eeg
  - neuroscience
  - eegdash
  - brain-computer-interface
  - pytorch
  - visual
  - memory
size_categories:
  - 1K<n<10K
task_categories:
  - other
---

# Penn Electrophysiology of Encoding and Retrieval Study (PEERS)

**Dataset ID:** `ds004395`

_Kahana2023_

**Canonical aliases:** `PEERS`

> **At a glance:** EEG · Visual memory · healthy · 364 subjects · 6483 recordings · CC0

## Load this dataset

This repo is a **pointer**. The raw EEG data lives at its canonical source
(OpenNeuro / NEMAR); [EEGDash](https://github.com/eegdash/EEGDash) streams it
on demand and returns a PyTorch / braindecode dataset.

```python
# pip install eegdash
from eegdash import EEGDashDataset

ds = EEGDashDataset(dataset="ds004395", cache_dir="./cache")
print(len(ds), "recordings")
```

You can also load it by canonical alias — these are registered classes in `eegdash.dataset`:

```python
from eegdash.dataset import PEERS
ds = PEERS(cache_dir="./cache")
```

If the dataset has been mirrored to the HF Hub in braindecode's Zarr layout,
you can also pull it directly:

```python
from braindecode.datasets import BaseConcatDataset
ds = BaseConcatDataset.pull_from_hub("EEGDash/ds004395")
```


## Dataset metadata

| | |
|---|---|
| **Subjects** | 364 |
| **Recordings** | 6483 |
| **Tasks (count)** | 3 |
| **Channels** | 129 (×4980), 137 (×1490), 144 (×11), 272 (×2) |
| **Sampling rate (Hz)** | 500 (×4946), 2048 (×1466), 512 (×28), 250 (×17), 1000 (×15), 1024 (×11) |
| **Total duration (h)** | 9,115.8 |
| **Size on disk** | 8.7 TB |
| **Recording type** | EEG |
| **Experimental modality** | Visual |
| **Paradigm type** | Memory |
| **Population** | Healthy |
| **Source** | openneuro |
| **License** | CC0 |
| **NEMAR citations** | 6.0 |

## Links

- **DOI:** [10.18112/openneuro.ds004395.v2.0.0](https://doi.org/10.18112/openneuro.ds004395.v2.0.0)
- **OpenNeuro:** [ds004395](https://openneuro.org/datasets/ds004395)
- **Browse 700+ datasets:** [EEGDash catalog](https://huggingface.co/spaces/EEGDash/catalog)
- **Docs:** <https://eegdash.org>
- **Code:** <https://github.com/eegdash/EEGDash>

---

_Auto-generated from [dataset_summary.csv](https://github.com/eegdash/EEGDash/blob/main/eegdash/dataset/dataset_summary.csv) and the [EEGDash API](https://data.eegdash.org/api/eegdash/datasets/summary/ds004395). Do not edit this file by hand — update the upstream source and re-run `scripts/push_metadata_stubs.py`._