Capturing Late Responses

[Andrew]

Hello,

I am currently designing an experiment which includes the capturing of
responses that are correct, but occur after the end of stimulus
presentation. For example, a Stroop cue may be presented for 600ms,
and the subject makes the correct response at 650ms, after the Stroop
cue has disappeared. I would like to be able to use the .ACC and .RT
attributes of the Stroop slide when creating new variables at the
trial level, and not have them default to zero if the subject does not
respond within 600ms of the onset of the Stroop cue.

I have partially figured out a way around this, by including a
textslide called "CaptureLateResponses" immediately after the Stroop
slide (let's call it "StroopSlide"). The duration of the StroopSlide
is 600ms and the duration of the CaptureLateResponses textslide is
400ms, for a total of 1000ms for the subject to make a valid response.
I have set the TimeLimit on the StroopSlide to be 1000ms, in order to
capture late responses. I have set the timing of both slides to
Cumulative, and I have set both to standard logging.

However, I am unable to store properties of the StroopSlide object
into variables at the trial level. For example, I wish to include only
trials in which both the current response and the previous trial's
response are correct. However, when I try to create this variable, I
find that, if the subject has not responded within the 600ms time
window that the StroopSlide object is present, both the accuracy and
response time attributes are set to zero. However, in the output edat
file, these values are processed normally, with responses slower than
600ms recorded in the StroopSlide.RT attribute, and correct responses
made after the 600ms time window recorded in the StroopSlide.ACC
attribute. Furthermore, when I insert a feedback slide after the
StroopSlide and CaptureLateResponses textslide, it appears to process
correct and incorrect responses normally, with late correct responses
still interpreted as correct.

Any feedback on why this is, and how to resolve this situation, would
be greatly appreciated.


Thank you,

-Andrew

[David McFarlane]

Andrew,

You are going about this the wrong way. You just need to use
"extended input", this is covered in Appendix C of the User's Guide
that came with E-Prime. While you are at it, you really owe it to
yourself and everyone else to work through *all* of the tutorials in
*all* the supplied documentation before you do any work in E-Prime.

Regards,
-----
David McFarlane
E-Prime training
online: http://psychology.msu.edu/Workshops_Courses/eprime.aspx
Twitter: @EPrimeMaster (twitter.com/EPrimeMaster)

[Stock reminder: 1) I do not work for PST. 2) PST's trained staff
take any and all questions at
http://support.pstnet.com/e%2Dprime/support/login.asp , and they
strive to respond to all requests in 24-48 hours -- this is pretty
much their substitute for proper documentation, so make full use of
it. 3) In addition, PST takes questions at their Facebook page
(http://www.facebook.com/pages/Psychology-Software-Tools-Inc/241802160683
), and offers several instructional videos there and on their YouTube
channel (http://www.youtube.com/user/PSTNET ) (no Twitter feed yet,
though). 4) If you do get an answer from PST staff, please extend
the courtesy of posting their reply back here for the sake of others.]

[Andrew]

Hi David,

Thank you for your reply. I actually was using the Extended Input
(i.e., the Time Limit field of the slide object); the problem turned
out to be another issue. I was using c.GetAttrib to return the value
of the object attribute, when I should have just used the variable
name.

Thanks,

-Andrew

On May 17, 2:55 pm, David McFarlane <mcfar...@msu.edu> wrote:
> Andrew,
>
> You are going about this the wrong way.  You just need to use
> "extended input", this is covered in Appendix C of the User's Guide
> that came with E-Prime.  While you are at it, you really owe it to
> yourself and everyone else to work through *all* of the tutorials in
> *all* the supplied documentation before you do any work in E-Prime.
>
> Regards,
> -----
> David McFarlane
> E-Prime training
> online:  http://psychology.msu.edu/Workshops_Courses/eprime.aspx
> Twitter:  @EPrimeMaster (twitter.com/EPrimeMaster)
>
> [Stock reminder:  1) I do not work for PST.  2) PST's trained staff

> take any and all questions athttp://support.pstnet.com/e%2Dprime/support/login.asp, and they

> strive to respond to all requests in 24-48 hours -- this is pretty
> much their substitute for proper documentation, so make full use of
> it.  3) In addition, PST takes questions at their Facebook page
> (http://www.facebook.com/pages/Psychology-Software-Tools-Inc/241802160683
> ), and offers several instructional videos there and on their YouTube

> channel (http://www.youtube.com/user/PSTNET) (no Twitter feed yet,