By default, optseq2 assumes that you want to perform an FIR analysis
where you get an average for each post-stimulus time point so that you
can create a waveform. This is in contrast to assuming the shape to the
hemodyn respnse where you only estimate a single value (the amplitude).
By default,
External Email - Use Caution
Dear Developers,
I am planning to run PVT (psychomotor vigilance task) in fMRI using event
related design. This is an extremely simple reaction time task: participant
has to respond to the appeared geometric shape as quickly as possible. The
key featur
The problem is that the dpsd is 0.5 which means that you want to perform
an FIR analysis to reconstruct the hemodynamic response at a temporal
resolution of 0.5 sec. This is probably not what you want to do. But you
need 0.5 because your TR is 2.5 and your stimulus is 3.5. A way around
this is
Hello!
I am trying to use optseq to optimize my study design and cannot get it to
accept the parameters I need for my task and I have officially stumped
those helping me at my institution so I need your help!
I am trying to run a very simple design where my stimuli are presented for
3.5 seconds a
4). Did i understand it right?
> >
> > Doug: Yes.
> Asaf: thanks.
>
> hope all is clearer now,
> Asaf.
>
>
> *From:* Douglas N Greve
> *To:* Asaf Kaftory
> *Cc:* freesurfer@nmr.mgh.ha
equals 1, Nullmin equals 2 and Nullmax equals 4, the NULL events
> > will be 2 3 or 4). Did i understand it right?
>
> Doug: Yes.
Asaf: thanks.
hope all is clearer now,
Asaf.
________
From: Douglas N Greve
To: Asaf Kaftory
Cc: freesurfer@nmr.mgh.har
;
> 2. ok, thanks. isn't it strange though? how do researches jitter the
> ISI than? manually?
>
> 3. thanks.
> *From:* Doug Greve
> *To:* Asaf Kaftory
> *Cc:* freesurfer@nmr.mgh.harvard.edu
> *Sent:* Saturday, September 26, 2009 7:42:43 PM
> *Subject:* Re: [Frees
an?
manually?
3. thanks.
From: Doug Greve
To: Asaf Kaftory
Cc: freesurfer@nmr.mgh.harvard.edu
Sent: Saturday, September 26, 2009 7:42:43 PM
Subject: Re: [Freesurfer] optseq2 help: DPSD and jitter
On Sat, 26 Sep 2009, Asaf Kaftory wrote:
> Hello list,
>
> I'm new to op
an?
manually?
3. thanks.
From: Doug Greve
To: Asaf Kaftory
Cc: freesurfer@nmr.mgh.harvard.edu
Sent: Saturday, September 26, 2009 7:42:43 PM
Subject: Re: [Freesurfer] optseq2 help: DPSD and jitter
On Sat, 26 Sep 2009, Asaf Kaftory wrote:
> Hello list,
>
> I'm new to op
On Sat, 26 Sep 2009, Asaf Kaftory wrote:
> Hello list,
>
> I'm new to optseq, and would like your help with the following issues:
> 1. What exactly does DPSD mean? and why does the TR has to be an integer of
> it?
Delta Post-Stimulus Delay. The time between samples in the
FIR. Usually, it is ju
Hello list,
I'm new to optseq, and would like your help with the following issues:
1. What exactly does DPSD mean? and why does the TR has to be an integer of it?
2. My experiment design uses jitter - both ITI (i.e., between
trials) and ISI (i.e., between stimulus within a compound event). As i
un
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