Cumulative RT for Two Events

David McFarlane mcfarla9 at msu.edu
Wed Sep 22 21:27:46 UTC 2010


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" at 
http://groups.google.com/group/e-prime/browse_thread/thread/39e899d3457d4917 
.

-- 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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