**5.2 Tasks and protocols**

The experiment was carried out in the playroom of the kindergarten that the children attended. Test subjects were positioned in a chair (seat height: 290 mm, back height: 510 mm) in front of a desk (height: 470 mm, width: 1200 mm, length: 750 mm) that they regularly used. The haptic device and the display were placed on the desk, as shown in Fig. 9.

The test subjects were asked to play the evaluation program. The goal of this program, called "Starfish", was to move the starfish from the right end to the left end of the display along the thick blue curve with a red centerline as quickly and precisely as they could. This program is a variation of the "Wave" program mentioned in the previous section. The display image is shown in Fig. 10. The experimenter asked the subject to bring the starfish back home quickly because a big fish is after it. Also, the user pays attention to sea urchins along the edge of the thick curve. The sea urchins can prick the starfish with their needles. In the experiment, the subjects tried three different haptic force settings. One is viscosity force, which is related to the velocity of the grip motion. The other one is assistance force, which guides the cursor to the target position. The last one is no force is applied. The experiments included another two different trial programs before the "Starfish" program. A total of 10 minutes was spent for each subject. After playing the experimental game, an interview was carried out.

Fig. 9. Subject in the experiment

Fig. 10. "Starfish" program used in the experiment
