Terminate list at set time, even if current sample no completed.

Mon Nov 11 21:31:51 UTC 2013

ah, of course. Silly mistake, that could have been prevented by just
running the example script once :-)

PG.

On 11 November 2013 22:00, David McFarlane <mcfarla9 at msu.edu> wrote:

> I would have said to set stimulus PreRelease to same as Duration and use
> inline code after the stimulus to look for the timeout, but I like Paul's
> solution much, much better and will add that to my own bag of tricks
> (thanks, Paul!).
>
> Just a couple more thoughts on this:
>
> 1) Shouldn't the line
>
>
>     timeLeft = 120000 - Stimulus.TargetOnsetTime
>
> instead read
>
>     timeLeft = 120000 - (Stimulus.TargetOnsetTime - FirstOnset)
>
> ?  Also, the first time the initialization line
>
>     FirstOnset = Stimulus.TargetOnsetTime
>
> runs, Stimulus.Target is 0, and that may adversely affect the Duration for
> the first run of Stimulus.  This could be fixed by instead using
> GetNextTargetOnset time, thus,
>
>     FirstOnset = GetNextTargetOnsetTime
>
> Also, timeLeft is based on the OnsetTime of the previous run of Stimulus,
> but I think you need to take into account how long that run lasted.  You
> could do that by using GetNextTargetOnsetTime instead.  Putting that all
> together, the inline code might instead read
>
>
>     ' FirstOnset is a global variable which is declared in the user
> section of
>     ' the script window
>     If (FirstOnset = 0) Then FirstOnset = GetNextTargetOnsetTime
>     Dim timeLeft As Long
>     timeLeft = 120000 - (GetNextTargetOnsetTime- FirstOnset)
>     If (timeLeft > 0) Then
>
>         Stimulus.Duration = timeLeft
>     Else
>         Stimulus.Duration = 0
>     End If
>
> Finally, instead of a FirstOnset you might instead use a LastOffset, thus
> (also using Iif() to suit my own peculiar tastes),
>
>     ' LastOffset is a global variable which is declared in the user
> section of
>     ' the script window
>     If (LastOffset = 0) Then LastOffset = GetNextTargetOnsetTime + 120000
>     Dim timeLeft as Long
>     timeLeft = LastOffset - GetNextTargetOnsetTime
>     Stimulus.Duration = Iif( timeLeft > 0, timeLeft, 0 )
>     ' or set Stimulus.Duration as an attribute reference
>
>
> 2) Alternatively, set your stimulus to use Cumulative timing mode, and set
> its Duration to 120000.   Define FirstOnset in global User Script as
> before.  Then in inline code at the start of the Procedure, use
>
>
>     ' FirstOnset is a global variable which is declared in the user
> section of
>     ' the script window
>     If (FirstOnset = 0) Then FirstOnset = GetNextTargetOnsetTime
>     SetNextTargetOnsetTime FirstOnset
>
> (see the SetNextTargetOnsetTime topic in the E-Basic Help facility).  Now
> each run of the stimulus will behave as though it started at the onset of
> the first run of the stimulus, and end 12000 ms after the start of the
> first run.
>
>
> It just depends on whether you prefer to manipulate stimulus Duration or
> NextTargetOnsetTime.  In any case, given the general principles, Kate and
> others should readily figure out the specifics.
>
> I went ahead and attached a demo program for each solution.  Thanks again,
> Paul, for the great inspiration!
>
> -- David McFarlane
>
>
>
> At 11/11/2013 03:15 AM Monday, Paul Groot wrote:
>
>> Hi Kate,
>>
>> Because the 'exit list' condition is tested at the end of each trial,
>> eprime doesn't handle timeout values that occur during the trial itself.
>> Even if the trial only contains a single object. The solution is to limit
>> the duration of the individual object(s).
>>
>> This is what I would do (assuming that the TextDisplay object is called
>> Stimulus):
>>
>> 1) Create a global variable in the user section of the script window:
>>
>> Dim FirstOnset As Long ' onsettime of first stimulus
>>
>> 2) Insert an inline script at the start of the trial procedure that
>> calculates the total time left, and use this value to change the stimulus
>> duration from infinite to the leftover time:
>>
>> ' FirstOnset is a global variable which is declared in the user section
>> of the script window
>> If FirstOnset=0 Then
>> FirstOnset = Stimulus.TargetOnsetTime
>> End If
>>
>> Dim timeLeft As Long
>> timeLeft = 120000 - Stimulus.TargetOnsetTime
>> If timeLeft>0 Then
>> Stimulus.Duration = timeLeft
>> Else
>> Stimulus.Duration = 0
>> End If
>>
>> Things can get a bit more complex if the trial contains several objects,
>> though.
>>
>> Also also see the attached example.
>>
>> Best
>> Paul
>>
>>
>>
>> On 11 November 2013 03:39, Kate Cox <<mailto:katehmcox at gmail.com>k
>> atehmcox at gmail.com> wrote:
>> Hi I'm very new to eprime and have no script background so please be
>> gentle :).
>> What I'm trying to do: present participants with a series of mathematical
>> equations which they must answer, using the keyboard. They must answer as
>> many equations as they can in 2 minutes. After 2 minutes the task will
>> terminate (and go on to the next task) even if they are part way through
>> giving an answer. The outcomes i'm measuring are accuracy, RT of correct
>> responses and number of correct responses in the 2 minute time window.
>> What is working and how I have it set up: I have 300 potential equations
>> in a list called "TrialList", which are presented on a TextDisplay. This
>> works perfectly.
>> Answers typed on the keyboard are echoed on the screen and logged. When
>> an answer is complete the participant presses ENTER and the the next
>> equation in my list is shown. This works perfectly.
>> In the TextDisplay properties, under the Duration/Input tab I have
>> duration as infinite, timing mode as Event, the keyboard as the only
>> device, allowable responses is any, time limit is same as duration and End
>> action is terminate.
>> In the list properties, under the Reset/Exit tab I have set Exit List to
>> "After 120 seconds"
>> The problem: I can't get the task to terminate at exactly 2 minutes. At
>> the moment it appears to stop when the trial that is running at 2 minute
>> mark is terminated (ie the participant presses enter).  For example if a
>> participant starts an equation at 1:55 then the task won't stop at 2:00 it
>> will wait until they submit their answer and that trial is terminated. As
>> some of my participants aren't particularly fast to provide their responses
>> this may end up being closer to 3 minutes than 2.
>> I'm pretty useless with script but I've found the bit that refers to the
>> termination settings and it looks like this:
>> Set TrialList.TerminateCondition = TimedMSecs(120000)
>> Set TrialList.ResetCondition = Samples(300)
>> TrialList.Reset
>> I've tried searching this group and the Eprime guide for the answers but
>> can't find how to fix it. I know some people have mentioned some script
>> that terminates at a particular clock setting  but my script seems to look
>> different to theirs so I'm not sure how to implement it. Also this maths
>> task is part of a larger battery of tasks so how a participant performs on
>> earlier tasks will determine where the running clock is when they get up to
>> the maths problems (ie a participant who is faster at earlier tasks may
>> start the math task at the 5 minute mark and someone who is slower might
>> start it at the 7 minute mark, so the running clock will be different 2
>> minutes into the math task).
>>
>> I hope all this makes sense. Any help would be hugely appreciated.
>> thank you in advance
>> Kate
>>
>
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