This BCI Challenge is being proposed as part of the IEEE Neural Engineering Conference (NER2015).
問題描述
在這次的競賽中,我們提供人在只注意視覺刺激情況下拼寫單詞的腦電數據。比賽的目標是檢測被試在拼寫任務中的錯誤。
設置
使用P300拼寫器,36個字符(字母或數字)呈現在屏幕上,目標是根據被試收到反饋後的腦電信號確定所選字符是否正確。
實驗設計
使用兩種拼寫方案:
- 快速模式,更容易出錯(每個字符閃爍4次)
- 慢速模式,不容易出錯(每個字符閃爍8次)
在最後一次閃爍之後,被試繼續觀察屏幕等待反饋,反饋內容爲所選字符的放大。即使獲得的反饋是錯誤的,要求被試繼續下一個字符的拼寫。
一共26個被試(13名男性,13名女性,年齡範圍20~37,平均年齡28.8±5.4)。所有被試的視力正常或者矯後正常,無P300或其他腦機接口經驗。56通道Ag/AgCl腦電傳感器記錄腦電信號,位置爲國際10-20系統,採樣率600Hz,以鼻子爲參考,接地端在肩膀,阻抗保持在10KΩ以下。
被試需要經歷5次拼寫,前4次每次拼寫由12個5個字母的單詞組成,第5次由20個5個字母的單詞組成。
數據集
200Hz頻率下采樣、EOG檢測眼動信號
數據文件
從上到下依次爲:
- 通道位置
- 數據提交格式
- 訓練標籤 (訓練集的標籤)
- 測試集 (10個其他被試的數據,5次訓練,50個數據文件)
- 訓練集(16個被試,5次訓練,80個數據文件,前4次訓練每次訓練60個反饋,第5次100個)
數據字段
‘通道位置’文件包含3個字段:
- 標籤:通道名稱
- 半徑:電極位置極座標半徑
- Phi:電極位置極座標角度
‘訓練集’和‘數據集’文件包含以下字段:
- Time: Timestamp of each sample(採樣時間戳)
- Fp1: EEG samples recorded from Fp1(Fp1電極記錄的信號)
- Fp2: EEG samples recorded from Fp2
- AF7: EEG samples recorded from AF7
- AF3: EEG samples recorded from AF3
- AF4: EEG samples recorded from AF4
- AF8: EEG samples recorded from AF8
- F7: EEG samples recorded from F7
- F5: EEG samples recorded from F5
- F3: EEG samples recorded from F3
- F1: EEG samples recorded from F1
- Fz: EEG samples recorded from Fz
- F2: EEG samples recorded from F2
- F4: EEG samples recorded from F4
- F6: EEG samples recorded from F6
- F8: EEG samples recorded from F8
- FT7: EEG samples recorded from FT7
- FC5: EEG samples recorded from FC5
- FC3: EEG samples recorded from FC3
- FC1: EEG samples recorded from FC1
- FCz: EEG samples recorded from FCz
- FC2: EEG samples recorded from FC2
- FC4: EEG samples recorded from FC4
- FC6: EEG samples recorded from FC6
- FT8: EEG samples recorded from FT8
- T7: EEG samples recorded from T7
- C5: EEG samples recorded from C5
- C3: EEG samples recorded from C3
- C1: EEG samples recorded from C1
- Cz: EEG samples recorded from Cz
- C2: EEG samples recorded from C2
- C4: EEG samples recorded from C4
- C6: EEG samples recorded from C6
- T8: EEG samples recorded from T8
- TP7: EEG samples recorded from TP7
- CP5: EEG samples recorded from CP5
- CP3: EEG samples recorded from CP3
- CP1: EEG samples recorded from CP1
- CPz: EEG samples recorded from CPz
- CP2: EEG samples recorded from CP2
- CP4: EEG samples recorded from CP4
- CP6: EEG samples recorded from CP6
- TP8: EEG samples recorded from TP8
- P7: EEG samples recorded from P7
- P5: EEG samples recorded from P5
- P3: EEG samples recorded from P3
- P1: EEG samples recorded from P1
- Pz: EEG samples recorded from Pz
- P2: EEG samples recorded from P2
- P4: EEG samples recorded from P4
- P6: EEG samples recorded from P6
- P8: EEG samples recorded from P8
- PO7: EEG samples recorded from PO7
- POz: EEG samples recorded from POz
- P08: EEG samples recorded from P08
- O1: EEG samples recorded from O1
- O2: EEG samples recorded from O2
- EOG: samples recorded from EOG derivation(EOG記錄的眼動信號)
- FeedBackEvent: a zero vector except for each occurring feedback timestamp for which value is equal to one
‘標籤’文件包含2個字段:
- IdFeedBack:反饋標識(S01 Sess01 FB001對應於被試1的第1次試驗中的第1個反饋)
- 預測信息:錯誤與正確分別爲0和1