Research On The Age Effect And Countermeasures Of Visual Search Tasks Compared With Real Pictures

Visual search is an important part of human visual cognition.With the aging of the population increase,the social participation of the elderly increase rapidly,a large number of studies have shown that,in a simple visual search task,the older subjects are cognitive aging,but in the real world,for the older adults,there are more complex scenarios in visual search,such as interface design for mobile phone APP.So we compared groups from young and older adults on a comparative visual search to explore the eye-movement characteristics,using monochrome images.In the study,We adopted 2×3×2 mixed experiment design.The independent variable 1 was the age,which was divided into young and older adult.The independent variable 2 is the number of graphs in each picture,5,8 and 11.The independent variable 3 is the type of target stimulus in each picture,which can be divided into different categories and different features of the same category.The dependent variables were the total fixation times,total fixation time,average fixation time,average eye-jump amplitude,target stimulation fixation time and other eye movement indicators.In the experiment,18 young adults and 18 older adults were selected to participate in the experiment.We used SPSS24.0 for repeated measurement variance analysis.The results of the experiment found that:(1)the older adults had cognitive aging in the real picture comparative visual search.Compared with the young adults,the total fixation time of the elderly increased significantly,the total fixation count increased significantly,the average fixation time increased significantly,and the average saccade amplitude decreased significantly.(2)with the increase of the number of graphics in the picture,the eye movement characteristics of the young people and the older adults show the same trend,the total fixation time of the picture increases significantly,the total fixation counts increases significantly,and the average saccade amplitude decreases significantly.(3)In the real picture comparative visual search,young people and older adults can identify the target stimuli more quickly when they are based on category differences than feature differences.When the number of graphics in the picture is small,the number of fixation of the target stimulus based on category is significantly less than that of the target stimulus based on the condition of feature.when the number of graphics is large,there is no significant difference in the number of gaze on the target stimulus under the two conditions.That is,when the task is less difficult,the cognitive processing process of comparative visual search shows greater priority to semantic concepts than perceptual features.