Assessing the impact of central and peripheral obstructions on visual behavior: insights from gaze-contingent eye-tracking studies

This dataset is a collection of image stimuli, as well as gaze tracks collected using visual field masks, such as central and peripheral scotoma, in order to assess the way people with visual field loss process visual stimuli in digital environments. This dataset is structured as follows : Stimuli: 125 fullHD images (1920x1080) used during the experiment trials; 4 fullHD images used during the training phase. Trials_metadata: Psychopy_outputs: various callbacks and logs files from the Psychopy experiment trials_metadata: .csv files containing metadata such as stimuli order and timestamps. Raw_eyetracking_outputs: subfolders containing the raw .edf files output by the Eyelink 1000+ eye-tracker. .edf files are divided into groups of 25 successive stimuli displayed. Raw_gaze_points: .csv files, containing the raw gaze points locations for each subject, stimulus and mask. Blinks, invalid coordinates and out-of-bounds gaze points are already removed from these files. Fixations: .csv files (one per image per participant) containing eye fixations locations extracted from the raw gaze points using a I-VT algorithm with a saccade velocity threshold of 45 deg/s. Experiment Images This database consists of 100 images collected from personal collections and various public image datasets, such as the CityScapes and the KITTI-360 datasets, covering a variety of themes, including landscapes, people, actions, and nature.Images had a 1920 x 1080 pixel resolution (FullHD) and were shown on a screen with the same resolution. Eye-tracking data collection The stimuli were presented to a group of 37 observers, with normal or corrected-to-normal vision. We used a table-mounted EyeLink 1000 Plus eye-tracker, working at a fixed rate of 1000Hz, with a chin rest to ensure data accuracy. Participants were informed that they would observe images both with and without simulated visual field impairments, and the two types of masks used were described. They were also told that the only task is to view the images freely. To familiarize participants with the different types of masks, four training images (distinct from the trial dataset) were provided in the training phase, with each image presented in the three conditions -- peripheral mask, foveal mask, and control (no mask) -- with varying mask sizes. In the trial phase, stimuli were displayed in a random order, with a randomly generated playlist ensuring no three consecutive stimuli were of the same image. A uniform gray screen was displayed between each stimulus. Viewing distance was set to be 90cm.Eye-tracker calibration was carried out using a 9-point calibration protocol, i.e., 9 points were sequentially and randomly shown on the screen, where the observer should fixate their gaze. Additionally, calibration was performed after every 25 displayed images. Each image was presented to the observers for a 5-second period. Each image in the database was presented to the observers under different conditions : - The image without any obstruction, referred to as the control condition (C). - Peripheral mask (P) simulating a tunnel vision, with two circular mask size variations (one individual mask for each eye): 1.5° and 4.5° radius of field of view, referred to as P1 and P2, respectively. - Foveal mask (F) simulating a central scotoma, also with two size variations: 1.5° and 4.5° radius of obstruction, referred to as F1 and F2, in that order.本数据集包含视觉刺激图像集，以及采用中央暗点（central scotoma）与周边暗点（peripheral scotoma）等视野掩码采集的眼动轨迹数据，用于评估视野缺损人群在数字环境中处理视觉刺激的方式。 本数据集的结构如下： 刺激集：包含实验试次中使用的125张全高清（fullHD，1920×1080）图像，以及训练阶段使用的4张全高清图像。 试次元数据： Psychopy输出文件：来自Psychopy实验的各类回调与日志文件 试次元数据：包含刺激呈现顺序、时间戳等元数据的.csv格式文件。 原始眼动输出文件夹：包含Eyelink 1000+眼动仪采集的原始.edf格式文件的子文件夹，这些.edf文件按连续呈现的25个刺激为一组进行划分。 原始注视点数据：.csv格式文件，包含每位被试、每张刺激图像及每种掩码条件下的原始注视点坐标。文件已剔除眨眼、无效坐标以及超出视野范围的注视点数据。 注视点数据：.csv格式文件（每位被试对应每张图像一个文件），包含通过I-VT算法从原始注视点数据中提取的眼注视点坐标，该算法的扫视速度阈值设为45 deg/s。 实验 图像集 本数据集包含100张图像，其中部分来自个人收藏，其余来自CityScapes、KITTI-360等公开图像数据集，涵盖风景、人物、行为与自然等多种主题。所有图像分辨率均为1920×1080（全高清），并以相同分辨率的屏幕进行呈现。 眼动数据采集 本实验向37名视力正常或矫正后正常的被试呈现刺激图像。我们采用台式Eyelink 1000 Plus眼动仪进行数据采集，采样率固定为1000Hz，并搭配下颌托架以保障数据采集精度。实验前告知被试将观看带有模拟视野缺损与无缺损的图像，并对两种掩码类型进行说明，同时告知被试仅需自由观看图像即可。 为让被试熟悉不同类型的掩码，训练阶段提供了4张与正式试次数据集不同的训练图像，每张图像分别在三种条件下呈现：周边掩码、中央掩码以及对照组（无掩码），且掩码尺寸存在不同变化。 正式试次阶段，刺激图像以随机顺序呈现，通过随机生成的播放列表确保不会出现三张连续图像为同一张的情况。每张刺激图像之间均呈现均匀灰色屏幕。 观看距离设置为90cm。眼动仪校准采用9点校准流程：在屏幕上依次随机呈现9个校准点，要求被试注视对应点位。此外，每呈现25张图像后需重新进行一次校准。 每张图像的呈现时长为5秒。 数据集内的每张图像均在以下三种不同条件下呈现给被试： - 无任何遮挡的对照组（C）； - 模拟管状视野的周边掩码（P），包含两种圆形掩码尺寸（单眼独立掩码）：视野半径分别为1.5°与4.5°，分别记为P1与P2； - 模拟中央暗点的中央掩码（F），同样包含两种尺寸变化：遮挡视野半径分别为1.5°与4.5°，依次记为F1与F2。