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Nessi in a BCI setting (in German). Depending on the colour of the link the user wants to choose, he steers the yellow feedback ball either into the top goal (red) or the bottom goal (green).
Making a choice in Nessi's navigation bar (in German). Here the user would like to choose the "back" button (framed black). In the first step, all 8 choices are divided into two groups, red and green. All the user has to do is choose the current colour of the "back" button, in this case RED:
The user has correctly chosen RED. Now the red group of 4 icons is once again split into 2 choices. Once again, the user has to choose RED:
The user has correctly chosen RED. The following step is a response verification step, i.e. had the user chosen red by mistake, but actually wanted to choose one of the other icons, he could now choose GREEN to get back to the other icons and correct his mistake. But in this case the user once again chooses RED:
In the following last step the user chooses GREEN to select the "back" button:
In this example, all buttons can be reached in 4 steps. It is however possible to configure Nessi in such a way that icons selected frequently can be reached in less steps, thereby speeding up the browsing experience.
Virtual keyboard (VK) (in English). The method for selecting a letter is exactly the same as for the example above.