Movement Time and Reaction Time of the Elderly

抄録

The proportion of people aged 60 and over to entire population is forecasted to exceed 30% in developed countries by the year 2050. Accessibility is being studied extensively since it is crucially important that the elderly access to the resources of modern economical and social life. A web application was developed in the study to examine the applicability of fundamental motor behavior laws to the elder users. Fitts' law has been believed a reliable and robust model in various human-computer interactions such as scrolling, selection of menu item, editing of documents, etc. However, movement times of the aged persons were not explained properly by Fitts' law. Target size and experience significantly affected the movement time, while distance to the target did not significantly affect the movement time. We also found that target size, age, and experience would affluence the error. Hick's law is another important principle applied to the choice response and it was inapplicable to the elderly. Target size and age except for the number of targets significantly affect choice selection time. We suggested efficient size of control objects (20-40 pixels) for senior users to minimize the performance time and error.