Objective and Subjective Evaluation of Online Error Correction during P300-Based Spelling

<table>Grand average EEG event-related dynamics for group with a high specificity in solid line (<svg height="11.375" id="M76" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 50.724998 11.375" width="50.724998" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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q0 -76 10 -138.5t37 -107.5t69 -45q32 0 55.5 25t35.5 68.5t17.5 91.5t5.5 105t-5.5 105.5t-18 92t-36 68t-56.5 24.5z" id="x30"></path></g>
</svg>) and group with a low specificity in dashed line (<svg height="11.375" id="M77" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 42.5625 11.375" width="42.5625" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.112)"><path d="M857 650l-6 -28q-44 -4 -61.5 -16.5t-29.5 -48.5q-11 -32 -37 -166l-78 -399h-29l-351 537h-4l-56 -276q-24 -120 -24 -164q0 -35 17.5 -46t75.5 -15l-6 -28h-245l7 28q41 2 62 14t31 44q10 30 41 171l53 245q8 44 6.5 60.5t-14.5 33.5q-10 15 -27 19.5t-64 6.5l6 28h153
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</svg>). (a) Responses to bad (grey) and good feedbacks (black) in channel Cz. (b) Difference of bad and good feedback responses in channel Cz. (c) Difference of target and non-target responses in channel P7.</table>

Advances in Human-Computer Interaction

fig10

Figure 10

Figure 10: Objective and Subjective Evaluation of Online Error Correction during P300-Based Spelling 