PMC5439234_01
End user 4 during testing of the prototype. In (A) the split screen mode is shown. In (B) the spelling matrix is displayed in full screen mode. The selected symbols were displayed in the line above the matrix such that the user received feedback although the corresponding application window for spelling was not inside his field of view. (C) depicts a close-up of the user and the electrode cap and in (D) the window size of the spelling matrix is adjusted to fit the application window size of his conventional software (dasher) used for communication. End user 4 gained only rudimentary control over the spelling application and did not test the other applications. Pictures are published with consent from the participant and his legal representative.
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F3
On the first day he tested the g.Nautilus with the dry g.Sahara electrodes and the system was displayed in the split screen mode (see Figure 3A). On the second day, he tested the system equipped with the gel-based electrodes first in the split screen and subsequently in the full screen mode (see Figure 3B). Further, to ensure that all icons could be equally well recognized, we reduced the size of the window (see Figure 3D) to match the size used during his conventional communication (with the dasher program) and performed a run with the standard timing parameters.
PMC5439234_02
End user 5 during testing of the prototype. (A) depicts the user wearing a medium sized electrode cap with the gel-based electrodes. (B) shows him in his wheelchair during testing on day 1. (C) is a picture taken on day 2 of testing and (D) a close up of the electrode cap with the reference electrode attached to the right earlobe. End user 5 gained control over the system. Pictures are published with consent from the participant and his legal representative.
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F4
In the second session, the participant was lying in his bed and the system was displayed in the split-screen mode on a 22" monitor positioned such that the screen was within his field of view (see Figure 4).
PMC5439234_03
End user 6 during testing of the prototype. The end user wearing the electrode cap with the g.Ladybird electrodes (A). (B) shows the end user seated in her wheelchair in front of the TV used to display the BCI2000 control matrix for spelling. The eye tracking system (C). The calibration matrix displayed on the TV screen (D). Pictures are published with consent from the participant and her legal representative.
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F5
She had previously used an eye tracking system for communication (see Figure 5), but had only limited control of it during the last 4 weeks prior to testing due to a decline in her ability to control eye movements. Afterwards we switched back to the gel-based electrodes (small cap size) and displayed the calibration matrix on a large screen TV in front of her (see Figure 5). On day 2, we used the BCI2000 software framework to display a 6 x 6 letter matrix on her large screen TV (see Figure 5). It was positioned in front of her such that her eyes could be detected by the system (see Figure 5).