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

Table 2

Bits per minute for the three compared spelling modes: no correction at all, automatic detection and predicted correction due to respelling, and automatic correction (online results).

Subjects	Spelling mode (bits/min)
	No correction	Error detection and respelling	Error detection and automatic correction (online)
S01	21.75	16.27	13.55
S03	3.25	3.01	3.27
S04	6.00	5.45	5.14
S06	4.69	5.45	4.37
S12	12.23	9.68	8.88
S14	10.20	8.97	9.39
S02	12.23	13.01	14.24
S05	18.29	18.68	19.23
S07	26.10	25.63	24.43
S08	25.08	25.48	24.79
S09	15.51	15.34	15.38
S10	21.30	23.51	26.59
S11	25.58	24.78	24.40
S13	7.42	7.82	10.43
S15	10.20	10.30	11.97
S16	27.15	28.07	28.61
Metasubjects
All	13.06	12.70	12.81
Spec < 0.75	9.03	7.71	7.37
Spec > 0.85	18.21	18.77	19.56