Millisecond Forums

Redefine value in each trial


Redefine value in each trial
View
Options
Author
Message
skotturi
skotturi
skotturi
posted 10 Years Ago
Partner Member (544 reputation)Partner Member (544 reputation)Partner Member (544 reputation)Partner Member (544 reputation)Partner Member (544 reputation)Partner Member (544 reputation)Partner Member (544 reputation)Partner Member (544 reputation)Partner Member (544 reputation)
Group: Forum Members
Posts: 2, Visits: 4
Dear Community, 

I am trying to use the Prospective Time Estimation task provided by Inquisit. 
Instead of just doing one trial at a fixed time interval of 53 seconds, I am trying to do multiple trials of random length. 

Instead of using:
<values>
...
/timeinterval = 5300
</values>

I'm using:
<values>
...
/timeinterval = ceil(rand(45,75))*1000
</values>
To achieve a random time interval in between 45 & 75 seconds. 

I'm currently just running two experiment blocks:
<expt >
/blocks = [1 = timeestimationstart, 2=timeestimationstart]
</expt>

This works except that the time interval variable isn't reassigned the second time, so my interval is the same for both trials. 
I have tried to force the reevaluation of the timeinterval variable:
<trial start>
/stimulustimes = [0=start, circle]
/timeout = [values.timeinterval = ceil(rand(45, 75))*1000]
/branch = [trial.end]
/recorddata = false
</trial>

But this fails with "Expression '[values.timeinterval' is invalid. Expression contains an unknown element or property name."
I could just hardcode a second timeinterval, a second trial and second variable to be exported but I'd prefer a more elegant solution. 
It's been a while since I've coded much in Inquisit, been spending most of my time in python, js & R. Thus I'm undoubtedly over thinking this, I think...

The code I'm working with can be found here (the prospective task): http://www.millisecond.com/download/library/TimeEstimation/

Cheers, 
Sante
Reply Like 130
GO

Merge Selected

Merge into selected topic...



Merge into merge target...



Merge into a specific topic ID...



Submit

Threaded View
Threaded View
Redefine value in each trial
skotturi - 10 Years Ago
     #1: Values are -- by design -- static. I.e. the expression in...
Dave - 10 Years Ago
             Great, that works and makes a lot more sense. The /ontrialbegin method...
skotturi - 10 Years Ago

Post Quoted Reply
Reading This Topic

Powered by InstantForum 2017-1 Final © 2024
Execution: 0.000. 2 queries. Compression Enabled.
Explore
Messages
Mentions
Search