Table 2.

Questionnaire results. The table presents the answers collected from the prequestionnaire. The figures show the number of respondents or the mean (SD) value.

Age	Gender		Vision correction		Tiredness					Length of sleep last night	Experience with BCIs
Years	Male	Female	Yes	No	1, not tired	2, little tired	3, moderately tired	4, tired	5, very tired	Hours	Yes	No
22.62 (5.00)	43	18	22	39	18	23	17	3	0	6.75 (1.22)	6	55