I am setting EVs and just wanted to make sure I am doing this correctly.
The study consists of an OSPAN (working memory task) portion), an arithmetic
portion, and a baseline. It goes as follows.
-----------I------------I ---------I ---------------
OSPAN 30s Response 15s Arith 30s Repeat
----------I ---------I
Base 30s Base 30s
So, the task w/ the response and the arithmetic are done 3 times total, and
baseline is done 6 times. I am not interested in including the response
condition in the analysis (this is just to verify they are paying attention,
at least for now).
I have setup the EVs as follows:
For the OSPAN: Skip = 0s, Off = 105s, On = 30s, Phase = 105s, Stop = -1.
For Baseline, I set up two EVs because the intervals vary, so the Baseline
after the OSPAN is: Skip = 0, Off= 105, On = 30, Phase = 60, Stop = -1.
Baseline after Arithemtic is: Skip = 0, Off = 105, On = 30, Phase = 0, Stop
= -1.
Arithemtic = Skip = 0, Off = 105, On = 30, Phase = 30, Stop = -1.
Is this correct? Also, when I set up my contrast for OSPAN vs. Baseline, I
choose OSPAN = 1, Baseline 1 = -.5, and Baseline 2 = -.5. This should make
it as if there was just one baseline, correct? Or are the statistics
affected differently somehow?
Lastly, I am setting the highpass filter at 135; this is the total time for
one cycle. Is this too high though?
Thanks.
|