Fig. 6

Misrecognized signals of a participant with ALS. The first and third rows show the misrecognized signals of participant No. 20. The second and fourth rows show their corresponding templates. The numbers on the top left corner of each axis denote the intended numbers to be written by the participant. Unexpected eye movements (additional or missing saccades) were highlighted by visual inspection of the signal. All preprocessing procedures were minimized (baseline removal and median filtering only) for visual inspection. The template patterns did not include eye fixation parts. First seven errors (i.e., 7 pairs of panels, a-f, b-g, c-h, d-i, e-j, k-m, and l-n) were associated with additional or missing saccades. The other two errors (m-o and n-p pairs) were caused by high frequency ripples possibly originating from microsaccades