Furthermore, the menu consisted of one home control object and sixteen circular objects with 80 pixels of diametrically, separated by 22° from each other. There were positioned in pairs of certain direction with a total of 17 different directions formed by an association of all circular objects. Each object represents a different colour and will change colour when the participant selects-click. The task of this test is to select-click and change the background colour of the targeted object.
At the beginning of each trial, the home control object colour was randomly specified. Details of the circular menu layout are shown in Figure 3.