<b>EEG dataset for multi-class Chinese character stroke and pinyin vowel handwriting imagery (16 subjects, CCS-HI &amp; SV-HI)</b>

<b> Version History</b> Version 3.0 (December 21, 2025)Dataset expansion: Added 5 new participants (sub-21 to sub-25), increasing total sample size from 16 to 21 (13 males, 8 females; age 22–32).Upload format adjustment: <br>1. Root-level files (e.g., `dataset_description. json`, `participants. tsv`) are uploaded individually (no compression);<br>2. Internal subfolders (e.g., `code/`, `sub-01/` to `sub-25/`, `stimuli/`) are uploaded as separate ZIP archives (retaining BIDS structure when extracted).<br>3. Metadata update: Updated `participants. tsv/json` to include new subjects’ demographics (age, gender, education level).<br>4. BIDS validation: The full dataset (post-extraction) passed BIDS compliance checks via the official BIDS Validator. Dataset Overview (Version 3.0) This EEG dataset supports Chinese handwriting imagery BCI research, with 2 tasks: CCS-HI: 5 Chinese character strokes (200 trials/session) SV-HI: 6 Pinyin monophthongs (240 trials/session) Key updates (vs. v2.0): Total subjects: 21 (13M/8F) Root files are directly accessible online; subfolders are provided as structured ZIPs (supports incremental downloads) Full metadata for new participants For detailed experimental design/preprocessing, refer to Version 2.0. UsageAccess via Figshare: https://doi.org/10.6084/m9.figshare.29987758.v3Root-level files (e.g., metadata) can be viewed/downloaded directly;To access subfolders (e.g., `sub-01/`, `code/`), download their corresponding ZIP archives and extract (retains BIDS structure);Incremental download support: Researchers who previously downloaded `sub-01` to `sub-20` can only download the new `sub-21` to `sub-25` ZIPs to update their dataset.