Univ. Grenoble Alpes, CNRS, Grenoble INP, GIPSA-lab, 38000, Grenoble, France.
Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, LPNC, 38000, Grenoble, France.
Sci Rep. 2019 Jan 24;9(1):560. doi: 10.1038/s41598-018-36510-0.
Previous studies have shown that face stimuli elicit extremely fast and involuntary saccadic responses toward them, relative to other categories of visual stimuli. In the present study, we further investigated to what extent face stimuli influence the programming and execution of saccades examining their amplitude. We performed two experiments using a saccadic choice task: two images (one with a face, one with a vehicle) were simultaneously displayed in the left and right visual fields of participants who had to initiate a saccade toward the image (Experiment 1) or toward a cross in the image (Experiment 2) containing a target stimulus (a face or a vehicle). Results revealed shorter saccades toward vehicle than face targets, even if participants were explicitly asked to perform their saccades toward a specific location (Experiment 2). Furthermore, error saccades had smaller amplitude than correct saccades. Further analyses showed that error saccades were interrupted in mid-flight to initiate a concurrently-programmed corrective saccade. Overall, these data suggest that the content of visual stimuli can influence the programming of saccade amplitude, and that efficient online correction of saccades can be performed during the saccadic choice task.
先前的研究表明，相对于其他类别的视觉刺激，面孔刺激会引发极其快速且不由自主的眼跳反应。在本研究中，我们进一步探究了面孔刺激在多大程度上影响眼跳的编程和执行，研究了其幅度。我们使用眼跳选择任务进行了两项实验：在参与者的左右视野中同时显示两个图像（一个带有面孔，一个带有车辆），参与者必须朝着包含目标刺激（面孔或车辆）的图像（实验 1）或图像中的十字（实验 2）发起眼跳。结果显示，即使参与者被明确要求将眼跳指向特定位置（实验 2），朝向车辆的眼跳也比朝向面孔的眼跳短。此外，错误眼跳的幅度比正确眼跳小。进一步的分析表明，错误眼跳在中途中断，以发起同时编程的校正眼跳。总体而言，这些数据表明视觉刺激的内容可以影响眼跳幅度的编程，并且在眼跳选择任务中可以进行有效的在线校正。
