[VoxBo] optimizing experimental designs

[Junghoon Kim]

Hi, 

We are also using optseq2 for our fast-event related design experiment.
Some folks advocated M-seq, but it had some constraints on the number of
events we can use, so we had no choice but optseq2.

This is a different subject, but has anyone had a problem with E-prime
in terms of timing when a fast-event related design using optseq2 is used? 
We found it lags behind about a couple of seconds after a 6-minute run (we
are using pre-release). I am curious how other people solved this issue.
Sorry, this is not an E-prime list, but Dan graciously allowed me to post this question!
(The real E-prime board looks not active much)

Thanks, Hoon


__________________________________

Junghoon Kim, Ph.D.
Institute Scientist
Moss Rehabilitation Research Institute
www.ncrrn.org/people/kim
www.einstein.edu/professional/research/article12881.html
>>> "Lila Chrysikou" <evangelg at psych.upenn.edu> 10/04/07 12:27 PM >>>
Hi Russell,

Optseq2 is available; an example script & some instructions appear below:

optseq2 --ntp 168 --tr 3  --psdwin 24 30  --ev E 6 36 --ev B 6 36 --nsearch
100 --repvar 0 --focb nCB10pt --nkeep 2 --o handedness

# ntp = number of TRs,
#tr = TR length
#psdwin = smallest number of null trials to include .. largest number of
null trials to include (make sure the upper limit is a little higher, will
not run #if the lower limit = upper limit)
# ev [Name of Condition] = Condition Length in Seconds (space) # of Trials
for that condition,
# nsearch = Number of searches (ideal 10000)
#nkeep number to keep (something like 100)
#make sure you are in the directory in which you want the sequences to be
saved
# o = name of directory which you want the sequences to be saved
#to open each optseq file, use emacs

~Lila
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Evangelia G. Chrysikou, Ph.D.
Post Doctoral Research Fellow
Thompson-Schill Lab

Center for Cognitive Neuroscience
Department of Psychology, University of Pennsylvania
3720 Walnut Street, Solomon Lab Room B51,
Philadelphia, PA 19104-6241

Office address: 3810 Walnut St.,Room 307, Philadelphia, PA 19104
215. 573.6726  (phone)
215. 898.1982  (fax)
E-mail: evangelg at psych.upenn.edu



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