2 slides equal to one time duration

[吉祥如意]

Dear  David McFarlane，
 I have tried your suggestion, it really works and it's quite simple
compared with what I performed before as : BSlide.Duration=2500-ASlide.RT,
 and one more question, why you use 2500 - (Clock.Read - ASlide.OnsetTime).
Thanks a lot.


2013/10/22 David McFarlane <mcfarla9 at msu.edu>

> Just for the record, I need to correct a bit of my advice here.  Earlier,
> I said that using
>
>     SetNextTargetOnsetTime ASlide.OnsetTime
>
> between ASlide and BSlide would make the total duration from the start of
> ASlide to the end of BSlide equal the specified Duration of BSlide (in this
> case, 2500 ms).  But I neglected to say that, for this to work, you must
> also set BSlide to use Cumulative timing mode.  This works because, in
> Cumulative timing mode, the TargetOnset time for whatever follows BSlide
> will be based on the TargetOnsetTime of BSlide (instead of actual
> OnsetTime), and BSlide.TargetOnsetTime will come from the
> NextTargetOnsetTime implied in the code above.  I generally like this
> approach because it eliminates any errors due to delays in starting BSlide.
>
> Furthermore, the line of code above makes the total duration of ASlide +
> BSlide act like Event timing mode (think it through).  If you want that to
> instead act like Cumulative timing mode, then that line should read
>
>     SetNextTargetOnsetTime ASlide.TargetOnsetTime
>
> i.e., use .TargetOnsetTime instead of just .OnsetTime.
>
>
> If you stubbornly insist on keeping BSlide set to Event timing mode, then
> the TargetOnset time for whatever follows BSlide will be based on the
> actual OnsetTime of BSlide, and you have no recourse but to manipulate the
> Duration of BSlide.  In that case, your inline code between ASlide and
> BSlide should look more like
>
>     BSlide.Duration = 2500 - (Clock.Read - ASlide.OnsetTime)
>
> or if you prefer,
>
>     c.SetAttrib "BSlideDuration", 2500 - (Clock.Read - ASlide.OnsetTime)
>
> and then use "[BSlideDuration]" as an attribute reference for the Duration
> of BSlide (see comments on assigning object properties directly in code vs.
> via attribute reference at https://groups.google.com/d/**
> topic/e-prime/dWpfjk-BeLs<https://groups.google.com/d/topic/e-prime/dWpfjk-BeLs>and
> https://groups.google.com/d/**topic/e-prime/g1Fv2CGaSeg<https://groups.google.com/d/topic/e-prime/g1Fv2CGaSeg>).
>
> Manipulating Duration (instead of NextTargetOnsetTime) also means that the
> actual duration of BSlide (and ASlide + BSlide) will vary depending on any
> delays in starting BSlide, but maybe that is what you want.
>
>
> -----
> David McFarlane
> E-Prime training online:  http://psychology.msu.edu/**
> Workshops_Courses/eprime.aspx<http://psychology.msu.edu/Workshops_Courses/eprime.aspx>
> Twitter:  @EPrimeMaster (https://twitter.com/**EPrimeMaster<https://twitter.com/EPrimeMaster>)
>
> /----
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>
> At 10/14/2013 02:22 PM Monday, David McFarlane wrote:
>
>> Not sure I follow your description of the problem.  But let's suppose you
>> have two Slides in your Procedure, let's call them ASlide and BSlide.
>>  ASlide takes a response, and the Procedure moves on to present BSlide
>> whenever ASlide gets a response, or 2000 ms, whichever comes first.  And
>> you want the total duration for ASlide & BSlide to be 2500 ms, i.e., BSlide
>> should last for 2500 - (ASlide_actual_duration).
>>
>> There are many ways to skin this cat.  My favorite method goes as
>> follows.  Set the Duration of BSlide to 2500, and in an Inline between
>> ASlide and BSlide, do the following:
>>
>>     SetNextTargetOnsetTime ASlide.OnsetTime
>>
>> That's all!  Understanding how this works takes some deeper understanding
>> of E-Prime timing models & mechanisms, more than I can go into here, but
>> look at the SetNextTargetOnsetTime topic in the E-Basic Help facility.  But
>> in short, with that bit of code, BSlide will use the actual OnsetTime from
>> ASlide in order to compute its own ending time, and so will end at 2500 ms
>> from the OnsetTime of ASlide, whithout you having to do anything more.
>>  Presto!
>>
>> -----
>> David McFarlane
>> E-Prime training online:  http://psychology.msu.edu/**
>> Workshops_Courses/eprime.aspx<http://psychology.msu.edu/Workshops_Courses/eprime.aspx>
>> Twitter:  @EPrimeMaster (https://twitter.com/**EPrimeMaster<https://twitter.com/EPrimeMaster>)
>>
>> /----
>> Stock reminder:  1) I do not work for PST.  2) PST's trained staff take
>> any and all questions at https://support.pstnet.com , and they strive to
>> respond to all requests in 24-48 hours, so make full use of it.  3) In
>> addition, PST offers several instructional videos on their YouTube channel (
>> http://www.youtube.com/user/**PSTNET <http://www.youtube.com/user/PSTNET>).  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.
>> \----
>>
>>
>> At 10/8/2013 10:00 PM Tuesday, Kim Goodyear wrote:
>>
>>> I am trying to have two sequential slides that are equal to one time
>>> duration of 2500 ms.  The first slide and the second slide are completely
>>> identical, except in the second slide the text color changes to red so that
>>> the participant can see their selection,  I want the first slide to
>>> terminate and then have the second slide come up so that they both equal
>>> the same 2500 ms.  Since the response time will vary I don't know how to
>>> make both slides equal to the same 2500.  I don't know why, but if the
>>> buttons aren't selected right away, the total duration is around 5000, or
>>> if there is a delay in the response, the total duration is around 4200.  I
>>> am not sure how to fix this issue, any advice would be great.  Here is my
>>> inline script:
>>>
>>> Dim ResetSlide as integer
>>> Dim x as integer
>>>
>>> ResetSlide = StimDisplay.Duration + StimDisplay2.Duration
>>> ResetSlide = x
>>> x = 2500
>>>
>>
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