Millisecond Forums

Trial order

https://forums.millisecond.com/Topic10386.aspx

By mimi_fd - 5/2/2013


Hello,



In my experiment I need to stimuli presented in the same order of condition, but the items of each condition in random ...



<block lexicalDecisionTask>



/ Trials = [1 = instructions; 2-161 = noreplace (ldtpseudopalabra, ldtpseudopalabra, ldtconcretaiconica, ldtabstractaarbitraria, ldtpseudopalabra, ldtabstractaiconica, ldtpseudopalabra, ldtconcretaarbitraria)]



</ block>



There are 4 conditions (ldtconcretaiconica, ldtabstractaarbitraria, ldtabstractaiconica, ldtconcretaarbitraria) and filler words. I need the order is above is met, but the items of each condition is present at random for each test pass.



There are 20 items per condition and 80 fillers.



Any solutions? Thanks!
By Dave - 5/2/2013

The code you posted has no bearing on how stimuli / items are sampled. You need to set that up via the respective <text>, <picture>, etc. elements' /select attributes.


If you want a fixed order of trials, you should not sample *randomly without replacement* (i.e., 'noreplace) but use sequential selection (i.e., 'sequence').
By mimi_fd - 5/2/2013

Thank u!!

By mimi_fd - 5/3/2013

I tested with "sequence", and now it is fulfilled the order of appearance of the conditions, but the items of each condition is repeated after a while and the task is endless... 


I don't know what to do... 
By Dave - 5/3/2013

See http://www.millisecond.com/forums/Topic4092.aspx#4092.