The object of this exercise is to extract the timing information
and use it to make a FEAT custom EV file (3 column).
- An example stimulus file
The file stim1.txt contains information about
stimulus timings for an event related experiment. The format
is:
Event No. Condition Code Onset Time Comment
View this file to see what it contains and how it is formatted.
- Extract lines for a single condition
Using grep extract all the lines
in the file that contain b1.
- Extract the timing column
Using awk extract just the timing column from these b1 lines.
Save the timing values as a variable.
- Creating the additional columns
Append two columns (fixed duration of 30.0 and value of 1.0) after the
timing number for each line to get a valid 3 column format for FEAT.
Hint: use a for loop over the values
Save the results in a file called stim1_b1.txt
- Processing the other condition(s)
Repeat the above for condition b2.
- Changing the TR (Advanced)
If the time information was in TRs (volume number) rather
than seconds, use bc to convert this to seconds given a
TR of 3.5 seconds.
Look here for the basic cheat or the fancy cheat.
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