On 7/29/16 3:17 AM, 連 志浩 wrote:
Hello all,
I'm a new user of Optseq2, and I have 2 questions about optseq2 after
I got some sequences and read Dale (1999).
I'll be grateful to anyone can provide help.
1. I'm curious about why optseq2 arranged the order of conditions,
does anyone can provided some references to me?
Dale (1999) just discussed about mean ISI and fixed/randomizes ISI
design, I wonder what's the difference if I just keep the duration
order of null condition (jitter) and randomly present different
conditions.
It tries a bunch of random orders until it finds one that is optimum in
terms of efficiency (you can also specifically optimize with respect to
counter balancing, use the --focb switch; I usually choose 100 for n).
With jittering (instead of a fixed ISI), you get more temporal
randomization (ie, differential overlap between adjacent events).
2. This question is about the total duration of experiments. I'm used
to execute experiments by E-Prime 2.0, and the presentation may delay
in E-Prime (I know this situation can be deal with "Pre-release"). If
there's a fixation period (15s) after my trials is over (but
participants are still scanned), and the delay just affect the
duration of the fixation period. Should I reduce the duration of
delayed stimulus in terms of the delayed time? Or I don't need to care
about the delay, because the key point is the order of conditions and
null/jitter?
I'm not sure what you mean. How can it be a delay if it is after the
trial is over?
Thanks for your reading.
Best regards,
Chih-Hao
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