Dear SPM experts:
I am a beginner of spm.I am confused about that my result of contast
between condition A and condition B will change greatly if I define the
inter-stimulus interval(with a small crosshair on the screen for fixation
between the appearance of A and B ) as a seperate Condition(Condition C).
Which result will be the correct one? Is it necessary to define the inter-
stimulus interval as a seperate condition in spm analysis?Or just leave it
as baseline?
And during my experiment,there are some instructions appeared on the
screen.Shall I also define the period of instructions as another condition
to avoid them be treated as Condition A or B?
Eager for your help.
zheng dongming
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