For the computer based simulation experiment called Virtual- Navi, we prepared two routes as shown on the left map of Figure 6. The first one was to a goal point located toward the south-east side of the starting point. Its total distance was 600 meter and was expected to be reached in 8 minutes in the best scenario. It also has 11 intersections where we had to choose which way to go and 5 corners where the road is bent. This route is very simple and easy. However, there are few landmarks on the route. Furthermore, in the spot indicated by the red circle in the Figure 6 (a), the street view had a malfunction. In this spot, the screen only showed the wall of a house. Therefore, the participants lost a sense of direction. The other path shown in the Figure 6 (b) was set rather longer, 2 km, and was expected to reach in only 30 minutes in the