Obstacle detection and facial emotion recognition are two critical visual tasks for pedestrians. In previous studies, the effect of changes in lighting was tested for these as individual tasks, where the task to be performed next in a sequence was known. In natural situations, a pedestrian is required to attend to multiple tasks, perhaps simultaneously, or at least does not know which of several possible tasks would next require their attention. This multi-tasking might impair performance on any one task and affect evaluation of optimal lighting conditions. In two experiments, obstacle detection and facial emotion recognition tasks were performed in parallel under different illuminances. Comparison of these results with previous studies, where these same tasks were performed individually, suggests that multi-tasking impaired performance on the peripheral detection task but not the on-axis facial emotion recognition task.

障碍物检测和面部表情识别是行人的两个重要视觉任务。在以前的研究中，将照明的变化效果作为单独的任务进行了测试，已知接下来要执行的任务。在自然情况下，行人可能需要同时参加多个任务，或者至少不知道接下来可能需要他们注意的几个可能任务中的哪个。这种多任务处理可能会削弱任何一项任务的性能，并影响最佳照明条件的评估。在两个实验中，在不同照度下并行执行障碍物检测和面部情感识别任务。将这些结果与以前的研究进行比较，以前的研究是分别执行相同的任务的，