Re: [Freesurfer] How does Optseq2 arrange order of conditions?
Dear Douglas,
I'm sorry that I didn't include previous correspondence in my email, from now
on, I'll remember to include it.
(I'm a new user of the FreeSurfer Mail Archive, I hope I include previous
correspondence at this time.)
Thanks for your reminding.
Best Regards,
Chih-Hao
Date: Fri, 5 Aug 2016 11:45:55 -0400
From: Douglas N Greve <gr...@nmr.mgh.harvard.edu>
Subject: Re: [Freesurfer] How does Optseq2 arrange order of
conditions?
To: freesurfer@nmr.mgh.harvard.edu
Message-ID: <57a4b4b3.1000...@nmr.mgh.harvard.edu>
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Please remember to include previous correspondence in your email.
On 08/01/2016 04:22 AM, ? ?? wrote:
>
> Dear Douglas,
>
> Thanks for your explanation. These information are helpful to me.
>
> >I'm not sure what you mean. How can it be a delay if it is after
> thetrial is over?
>
> I?m sorry for I didn?t describe my second question well. I think I can
> take another situation to describe my question.
>
> If I have a experiment that present stimulus until participants
> response, and I know the average RT of this experiment is 1500 ms
> after pilot test.
>
> In this situation, should I +/- the duration of jitter/null condition
> in terms of the duration of each stimulus?
>
> For example, if a part of sequence Optseq2 output is ? Con1 Null(500
> ms) Con2 Null(1500 ms)?, and one of participants takes 1000 ms to
> response for Con1.
>
> Should I add 500 ms to the first Null? or I don?t need to anything?
>
> Thanks for your reading.
>
> Best Regards,
>
> Chih-Hao
>
>
>
> ___
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Re: [Freesurfer] How does Optseq2 arrange order of conditions?
Please remember to include previous correspondence in your email. On 08/01/2016 04:22 AM, 連 志浩 wrote: > > Dear Douglas, > > Thanks for your explanation. These information are helpful to me. > > >I'm not sure what you mean. How can it be a delay if it is after > thetrial is over? > > I’m sorry for I didn’t describe my second question well. I think I can > take another situation to describe my question. > > If I have a experiment that present stimulus until participants > response, and I know the average RT of this experiment is 1500 ms > after pilot test. > > In this situation, should I +/- the duration of jitter/null condition > in terms of the duration of each stimulus? > > For example, if a part of sequence Optseq2 output is “ Con1 Null(500 > ms) Con2 Null(1500 ms)”, and one of participants takes 1000 ms to > response for Con1. > > Should I add 500 ms to the first Null? or I don’t need to anything? > > Thanks for your reading. > > Best Regards, > > Chih-Hao > > > > ___ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer -- Douglas N. Greve, Ph.D. MGH-NMR Center gr...@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ ___ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
Re: [Freesurfer] How does Optseq2 arrange order of conditions?
Dear Douglas, Thanks for your explanation. These information are helpful to me. >I'm not sure what you mean. How can it be a delay if it is after the trial is >over? I’m sorry for I didn’t describe my second question well. I think I can take another situation to describe my question. If I have a experiment that present stimulus until participants response, and I know the average RT of this experiment is 1500 ms after pilot test. In this situation, should I +/- the duration of jitter/null condition in terms of the duration of each stimulus? For example, if a part of sequence Optseq2 output is “ Con1 Null(500 ms) Con2 Null(1500 ms)”, and one of participants takes 1000 ms to response for Con1. Should I add 500 ms to the first Null? or I don’t need to anything? Thanks for your reading. Best Regards, Chih-Hao ___ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
Re: [Freesurfer] How does Optseq2 arrange order of conditions?
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 ___ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer ___ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
[Freesurfer] How does Optseq2 arrange order of conditions?
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. 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? Thanks for your reading. Best regards, Chih-Hao ___ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
