Abstract
The application of VDT systems into work places in various kinds of working field has rapidly been becoming very common in the past few years. A series of experiments was carried out while using 14 male college students aged from 22 to 23 years old and VDT work to evaluate their information processing ability relating to working hours. As for the results, information processing ability seems to be correlated significantly with the prolongation of working hours done by VDT.