Cumulative RT for Two Events

[David McFarlane]

Mich,

May I suggest a variant on this?

First, let's call myFeedback "FeedbackText", just for the sake of 
clarity.  Then, in FeedbackText, put

Your cumulative reaction time was: [RTcum]

Then in the inline between Stim2 and FeedbackText, do

c.SetAttrib "RTcum", Stim1.RT + Stim2.RT

In general I prefer not to manipulate the .Text property directly 
because then there is no clue in the object itself that its text will 
change at run time, which could lead to some programming confusion.  Oh 
yes, I could put "This text will change at run time" right into 
FeedbackText, but using text plus an attribute reference seems much 
clearer to me.  Finally, this also leaves RTcum in the log, which in 
this case you would want anyway.

Regards,
-- David McFarlane, Professional Faultfinder


Michiel Spape wrote:
> Hi,
> Personally, I find feedback displays, which I expect you'll be using, a huge bother. They never exactly display what I want them to display, their default properties and colours are always off, and they stop the experiment from running as soon as their input object is missing. 
> 
> Instead, if you have two TextDisplays acting as stimulus displays, say Stim1 and Stim2, and both are responded to, what's the problem with:
> 1. Adding yet another textdisplay after Stim2, let's call it myFeedback. Don't add any text to it.
> 2. Adding an inline between Stim2 and myFeedback: myFeedback.Text = "Your cumulative reaction time was: " & cstr(Stim1.RT + Stim2.RT)
> ?
> 
> There's an example somewhere in the e-primer (though it might be an exercise?) on giving feedback based on the amount of correct responses within a block - http://www.cognitology.eu/pubs/AnE-Primer2009.pdf
> Shouldn't be too difficult to change that into giving feedback based on the cumulative RT.
> 
> Cheers,
> Mich
> 
> Michiel Spapé
> Research Fellow
> Perception & Action group
> University of Nottingham
> School of Psychology
> www.cognitology.eu
> 
> 
> -----Original Message-----
> From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf Of Jordan Schoenherr
> Sent: 23 September 2010 02:20
> To: E-Prime
> Subject: Re: Cumulative RT for Two Events
> 
> 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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