A way to export button press data using scripts without terminating stimulus?

[Emz]

Okay, I think I understand your suggestions - will try to implement!

On Mar 25, 4:23 pm, ben robinson <baltimore.... at gmail.com> wrote:
> your last option, though a little messy, is the only way to go, i think.
>
> >>- have the stimulus terminate upon response and go to the logging
>
> script, then reappear for the remainder of the unused time, and same
> for the blank screen afterward. I am attempting this solution, but it
> is quite messy and round-about because the response may occur during
> the stimulus presentation or during a blank screen.
>
> here's how i would consider doing it:
> first, plan to have the SlideObject, or whatever is presenting your stim
> have a Duration of 0, but a response window as long as you'd like to be
> collecting responses.
> set up a variable to record the time (Clock.Read) in an Inline immediately
> preceding your SlideObject with 0 ms duration.
> then in an Inline immediately following your SlideObject, have a loop.
> something like this:
> Do
>    If SlideObject.RT>0 And NotYetSignaledMatlab=TRUE Then
>       send your event code to matlab
>       NotYetSignaledMatlab=FALSE
>    End If
> Loop Until (Clock.Read - yourTimeVariable) > yourStimDuration
> clear the screen then
> Do
> Loop Until (Clock.Read - yourTimeVariable) > (yourStimDuration +
> yourBlankScreenDuration)
>
> hope that helps.
>
> ben
>
> On Tue, Mar 24, 2009 at 2:36 PM, Emz <emzcof... at gmail.com> wrote:
>
> > Dear E-Prime people,
>
> > I would like to know if E-Prime has some capability to run a script at
> > any time during a task upon button press without interrupting its user-
> > end activities.
>
> > The problem in more detail is as follows:
>
> > I am using a variant of the N-back task and would like to precisely
> > log when the user presses one of the two response buttons. I know this
> > is easy to do using E-Prime's logging functions; however, I am
> > exporting data in real time to a MatLab matrix in another computer
> > which is necessary for my experimental set-up. The data transfer is
> > accomplished through a few lines of script, which I have inserted in
> > appropriate places in the E-Prime code to mark events of interest.
> > This works nicely, except for subject responses since the stimulus
> > needs to be shown for a fixed length of time.
>
> > I have considered a few possible solutions, but none seem very good:
> > - have the stimulus terminate upon response and go to the logging
> > script; however, this affects the task in undesirable ways
> > - use script to collect and output the E-Prime reaction time, correct
> > response info, etc. after the trial finishes. This means the reaction
> > time data will be desynchronized with the rest of the data file and
> > will require additional calculations to identify where in the data
> > file the button press took place. I am concerned this will introduce
> > error as there are already several data files with different sampling
> > rates to be aligned post-experiment.
> > - have the stimulus terminate upon response and go to the logging
> > script, then reappear for the remainder of the unused time, and same
> > for the blank screen afterward. I am attempting this solution, but it
> > is quite messy and round-about because the response may occur during
> > the stimulus presentation or during a blank screen.
>
> > Ideally, I would just need a way to execute the send script during the
> > stimulus presentation when the subject responds, without terminating
> > the activity. Any ideas if this is even possible?
>
> > Pointers / help function references, etc. all welcome,
>
> > EC
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