I do appreciate your help. Actually, your post is reallly interesting and it has been very useful for me.
You wrote "..This indicates that there are 3 output signals that will be generated (the "Output Channel"
column)...". So, if I have understood correctly, three outputs are available from the BCI2000
classifier and I can obtain three different commands directly from it. In addition, while for the first
two commands the parameters have been already identified I would need a training period
to identify the parameters associated to the third mental task, namely the channel(s) and frequency
bins correlated with such a task. This could be achieved using the BCI2000 stimulus presentation task
and the BCI2000 offline analysis tool.
Now, the question is: WHICH task can be choosen and HOW can it be identified?
Obviously, it would be convenient to choose a mental task that is easy to execute and discriminate
with respect to the other two (that I suppose to be the imagery of the movement of the
right hand/arm and of the left hand/arm).
In order to achieve that I could follow two different directions.
The first one is to follow the Millan's approach. According to his work, I could choose the third
mental task among the additional taskes he proposed, e.g., imagery of cube rotation, mental
subtraction, word association. I wonder how complicated would be for the user to think about
a rotating cube in order to turn left, but this is not an issue..at least for now
The tricky part is that even if i decide to use one of the Millan's mental tasks I don't know which part(s)
of the brain would be involved in these "non motor" activities, that means I don't know which
is(are) the electrode(s) to associate to the input channel of the classifier.
Otherwise, I could think to use a third motor task. Do you think this would be easy to execute?
If so i could chose:
1) imagery of movement of left arm [foot]
2) imagery of movement of right arm [foot]
3) imagery of movement of one foot [arm]
There could be any problem concerning the spatial proximity of the two brain areas associated to the
hand and the foot movements?
To summarize, I think that the imagery of foot or arm movements is easier than the one of a
cube rotation, a mental subtraction or word association, from the user point of view.
Nevertheless, the fact that Millan decided to choose a non motor task suggests that perhaps my opinion is
not completely correct
What do you think about that?
Thank you again for your time!