Pre-AttentiveGaze: Gaze-based Authentication Dataset with Momentary Visual Interactions

Pre-attentiveGaze dataset is designed to enable gaze-based authentication using momentary eye movement information. This dataset was constructed by collecting 76,840 gaze samples from 34 participants over 5 sessions and includes both the raw dataset and extracted gaze feature dataset. The raw dataset contains trial data and validation data, while the gaze feature dataset is extracted from the trial data for the purpose of modeling the classification of participants. The gaze feature dataset includes two tsv files, "MultipleVC.tsv" and "SingleVC.tsv", containing gaze feature data corresponding to their respective stimuli types. <br>

The data variables of the Pre-AttentiveGaze dataset are as follows. <br><br>

[Raw Data description] <br>
Recording timestamp<br>
- Description: Timestamp counted from the start of the recording<br>
- Column: recording timestamp<br>
- Unit: µs<br>
Gaze point 2D<br>
- Description: Raw gaze coordination for both eyes combined<br>
- Column: Gaze point X, Gaze point Y<br>
- Unit: pixel <br>
Pupil diameter <br>
- Description: Estimated size of the eye pupil<br>
- Column: Pupil diameter left, Pupil diameter right<br>
- Unit: mm<br>
Pupil diameter filtered<br>
- Description: Pupil diameter after applying pupil diameter filter(noise reduction by moving median) <br>
- Column: Pupil diameter filtered<br>
- Unit: mm<br>
Validity of eye data<br>
- Description: Indication whether the eyes have been correctly identified<br>
- Column: Validity left, Validity right<br>
- Unit: Valid/Invalid<br>
Eye position<br>
- Description: 3D position of the eyes <br>
- Column: Eye position left X, Eye position left Y, Eye position left Z, Eye position right X, Eye position right Y, Eye position right Z<br>
- Unit: mm<br>
Eye movement type<br>
- Description: Type of eye movement event classified by the I-VT(velocity threshold identification) filter applied during the gaze data export<br>
- Column: Eye movement type <br>
- Unit: Fixation/Saccade/Unclassified/EyesNotFound<br>
Gaze event duration<br>
- Description: Duration of the currently active eye movement<br>
- Column: Gaze event duration<br>
- Unit: ms<br>
Eye movement type index<br>
- Description: Order number in which an eye movement was recorded<br>
- Column: Eye movement type index <br>
- Unit: number<br>
Fixation point<br>
- Description: Coordination of the fixation point. <br>
- Column: Fixation point X, Fixation point Y<br>
- Unit: pixel<br><br>

[Validation Data Description] <br>
- Participant: ID for the participant who performed that calibration phase<br>
- Session: The session number during which the calibration phase was conducted<br>
- Stimuli type: The stimuli type presented after the calibration phase<br>
- List of stimuli index number: List of the stimuli indices presented after the calibration phase<br>
- Average validation accuracy: The average deviation between the predicted gaze points and the actual gaze targets<br>
- Average validation precision RMS: The RMS deviation of the predicted gaze points from their mean. <br><br>

[Gaze Feature Dataset Description] <br>
Raw Gaze<br>
- X: Corresponding to Gaze point X (x1, …, x84) <br>
- Y: Corresponding to Gaze point Y (y1, …, y84) <br>
Eye Movement<br>
- Path length: Length of path traveled in screen<br>
- Gaze velocity: Velocity of path traveled in screen<br>
- Gaze angle: Angular changes between consecutive raw gaze points<br>
- Eye movement type: Type of eye movement event classified by the I-VT filter; Fixation: 1, Saccade: 2, else: 0<br>
Fixation<br>
- Reaction time: Time until the first fixation is made outside the cross point (equal to the first fixation time) <br>
- Fixation duration: Duration per fixation interval<br>
- Fixation dispersion: Spatial spread during a fixation<br>
Fixation count: Number of fixation intervals identified within 84 sampled gaze points<br>
Saccade<br>
- Saccade duration: Duration per saccade interval<br>
- Saccade amplitude: The angular distance traveled by the eye during a saccadic movement<br>
- Saccade velocity: The angular speed of the eye during a saccade<br>
- Saccade dispersion: Spatial spread during a saccade<br>
- Saccade count: Number of saccade intervals identified within 84 sampled gaze points<br>
MFCC: 12 Mel-frequency cepstral coefficients for overall stimuli<br>
Pupil<br>
- Left pupil diameter: Pupil diameter of left eye<br>
- Right pupil diameter: Pupil diameter of right eye<br>
- Filtered pupil diameter: Pupil diameter after applying pupil diameter<br>

前注意注视（Pre-attentiveGaze）数据集旨在依托瞬时眼球运动信息，实现基于注视轨迹的身份认证任务。本数据集共招募34名受试者，在5次实验会话中累计采集76840条注视样本，包含原始数据集与提取后的注视特征数据集两类数据。其中原始数据集包含试次数据与校准验证数据，而注视特征数据集则从试次数据中提取得到，用于构建受试者身份分类模型。注视特征数据集包含两个TSV文件："MultipleVC.tsv"与"SingleVC.tsv"，分别对应两类刺激类型的注视特征数据。

数据集的变量说明如下：

[原始数据说明]
1. 记录时间戳
- 说明：以记录启动时刻为基准的计时戳
- 列名：recording timestamp
- 单位：微秒（µs）
2. 二维注视点
- 说明：双眼合并后的原始注视坐标
- 列名：Gaze point X、Gaze point Y
- 单位：像素（pixel）
3. 瞳孔直径
- 说明：眼部瞳孔的估算尺寸
- 列名：Pupil diameter left、Pupil diameter right
- 单位：毫米（mm）
4. 滤波后瞳孔直径
- 说明：经移动中值滤波降噪处理后的瞳孔直径数据
- 列名：Pupil diameter filtered
- 单位：毫米（mm）
5. 眼部数据有效性
- 说明：标识双眼是否被正确识别的指标
- 列名：Validity left、Validity right
- 取值：有效/无效（Valid/Invalid）
6. 眼部三维位置
- 说明：双眼的三维空间位置
- 列名：Eye position left X、Eye position left Y、Eye position left Z、Eye position right X、Eye position right Y、Eye position right Z
- 单位：毫米（mm）
7. 眼球运动类型
- 说明：通过注视数据导出阶段应用的I-VT（velocity threshold identification）滤波器分类得到的眼球运动事件类型
- 列名：Eye movement type
- 取值：注视（Fixation）、扫视（Saccade）、未分类（Unclassified）、未检测到眼球（EyesNotFound）
8. 注视事件时长
- 说明：当前活跃眼球运动事件的持续时间
- 列名：Gaze event duration
- 单位：毫秒（ms）
9. 眼球运动类型索引
- 说明：眼球运动事件的记录序号
- 列名：Eye movement type index
- 单位：数值
10. 注视点坐标
- 说明：注视点的空间坐标
- 列名：Fixation point X、Fixation point Y
- 单位：像素（pixel）

[校准验证数据说明]
- 受试者：执行该校准阶段的受试者编号
- 会话：该校准阶段所属的实验会话编号
- 刺激类型：校准阶段后呈现的刺激类型
- 刺激索引列表：校准阶段后呈现的所有刺激索引组成的列表
- 平均验证准确率：预测注视点与实际注视目标之间的平均偏差
- 平均验证精度均方根（RMS）：预测注视点相对于其均值的均方根偏差

[注视特征数据集说明]
### 原始注视数据
- X：对应二维注视点的X坐标（x1, …, x84）
- Y：对应二维注视点的Y坐标（y1, …, y84）

### 眼球运动特征
- 路径长度：屏幕坐标系下的眼球运动路径总长度
- 注视速度：屏幕坐标系下的眼球运动路径速度
- 注视角度：连续原始注视点之间的角度变化量
- 眼球运动类型：经I-VT滤波器分类的眼球运动事件类型，其中注视（Fixation）记为1、扫视（Saccade）记为2，其余情况记为0

### 注视特征
- 反应时间：首次在十字交叉点外产生注视的时长（等同于首次注视出现时刻）
- 注视持续时长：单次注视区间的持续时间
- 注视离散度：单次注视期间的空间分布离散程度
- 注视计数：84条采样注视点中识别出的注视区间总数量

### 扫视特征
- 扫视持续时长：单次扫视区间的持续时间
- 扫视幅度：扫视运动过程中眼部移动的角距离
- 扫视速度：扫视运动过程中眼部的角速度
- 扫视离散度：单次扫视期间的空间分布离散程度
- 扫视计数：84条采样注视点中识别出的扫视区间总数量

### MFCC特征
针对整体刺激的12个梅尔频率倒谱系数（Mel-frequency cepstral coefficients, MFCC）

### 瞳孔特征
- 左眼瞳孔直径：左眼的瞳孔直径数据
- 右眼瞳孔直径：右眼的瞳孔直径数据
- 滤波后瞳孔直径：经滤波处理后的瞳孔直径数据