Cumulative RT for Two Events

Jordan Schoenherr psychophysics.lab at gmail.com
Thu Sep 23 01:20:20 UTC 2010


Hi David,

I'll definitely check this out. Concerning my meaning, I have two
successive events and I want to sum the RT for event 1 and event 2 to
create a cumulative RT.

On Sep 22, 5:27 pm, David McFarlane <mcfar... at msu.edu> wrote:
> Jordan,
>
> Just making sure...  Please be advised that "Cumulative" timing mode
> does *not* in any way, shape, or form produce a "cumulative RT",
> whatever that means.  Cumulative timing mode only affects how E-Prime
> schedules the onset time of the next object.  For details, study Chapter
> 3 of the User's Guide that came with EP; you might also look at my
> earlier post, "Mastering E-Prime: Meaning of all time audit measures" athttp://groups.google.com/group/e-prime/browse_thread/thread/39e899d34...
> .
>
> -- David McFarlane, Professional Faultfinder
>
>
>
> Jordan Schoenherr wrote:
> > And now for my final realization: if I turn off the logging function
> > for the second event, that should do the trick.
>
> > On Sep 22, 5:00 pm, Jordan Schoenherr <psychophysics.... at gmail.com>
> > wrote:
> >> I'll just post on my own thread:
>
> >> So it seems that each event that is given a cumulative value is placed
> >> in the RT recording sequence and RT feedback is provided for the final
> >> event. I'm still interested in whether I can use the acc from the
> >> first event in the feedback sequence?
>
> >> On Sep 22, 4:25 pm, Jordan Schoenherr <psychophysics.... at gmail.com>
> >> wrote:
>
> >>> Hi All,
> >>> As my subject indicates, I'm interested in obtaining the RT for two
> >>> successive events individually and cumulatively. The latter will be
> >>> used for feedback but have accuracy ONLY for the first event. Now,
> >>> from what I can tell, the experiment 'NestingXRT' provides an example
> >>> of how this can be accomplished.
> >>> In the second event, 'time audit only' is selected in the duration/
> >>> input window data logging and 'cumulative' is selected in the data
> >>> audit window. From what I can tell, this would seem to mean that this
> >>> event retains information from the previous two ('stimulus 1' and
> >>> 'stimulus 2'), however, I'm more concerned about where the
> >>> accumulation process starts and how this is specified.
> >>> In short,
> >>> 1) I want to record each event individually;
> >>> 2) I want to have a way to obtain the cumulative RT for events 1 and 2
> >>> (but not fixation or anything else that precedes the stims);
> >>> 3) Present RT feedback based on cumulative RT (but accuracy only for
> >>> the first event).
> >>> Any help would be of great assistance!
> >>> Cheers,
> >>> Jordan

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