Table 2.

All items of the adapted QCM are translated from German to illustrate the nature of the questionnaire (English version not validated).

Item	Statement	Factor
1	I look forward to work with the BCI today	I
2	I think I can deal with the difficulties of this task	M
3	Probably the training will not go well today	M
4	I like improving my strategies or trying out new strategies for the training	I
5	I feel under pressure to perform well	F
6	The training is a big challenge for me	C
7	I look forward to start with today's training	I
8	I am very curious how I will perform today	C
9	I dread a little that I can embarrass myself here	F
10	I am fully determined to give my best in the training	C
11	I don't need a reward for the training; I also have fun just like that	I
12	It's embarrassing for me to fail here	F
13	I think that everyone can control his/her brain activity	M
14	I think I won't be able to accomplish the training today	M
15	When I do well in the training today, I will be proud of my achievement	C
16	I am worried when thinking about the training	F
17	I would also train outside the training hours	I
18	The training demands paralyze me	F

The third column contains information which motivational factor the item measures: I, interest; M, mastery confidence; F, incompetence fear; C, challenge. Item 3 and 14 have to be reversed.